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All questions of Acids and Bases for Primary 5 Exam
Acid turns blue litmusA: OrangeB: PinkC: greenD: RedCorrect answer is 'D'. Can you explain this answer?
Acid turns blue litmus
A: Orange
B: Pink
C: green
D: Red
|
Jithin Chawla answered |
Acids turn blue litmus red. Litmus paper is used as indicator to check acids and bases.
Which of the following is a natural indicator- a)Turmeric
- b)Methyl orange
- c)Oxalic acid.
- d)Phenolphthalein
Correct answer is option 'A'. Can you explain this answer?
Which of the following is a natural indicator
a)
Turmeric
b)
Methyl orange
c)
Oxalic acid.
d)
Phenolphthalein
|
Sanjana Kumar answered |
Some of the natural indicators are red cabbage juice, onion paste, turmeric, lemon juice etc. Natural indicators are turmric,litmus,china rose etc are some natural indicators. Some Natural Indicators are red Cabbage juice,turmeric,china rose[hibiscus] and litmus.
Which of the following is a strong Base?- a)Copper hydroxide
- b)Sodium hydroxide
- c)Iron hydroxide
- d)Calcium oxide
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a strong Base?
a)
Copper hydroxide
b)
Sodium hydroxide
c)
Iron hydroxide
d)
Calcium oxide
|
Mohit Gupta answered |
Sodium hydroxide is a strong base and highly corrosive in nature.
Which of the following in not a natural indicator?- a)Phenolphthalein
- b)Rose petals
- c)Litmus
- d)Turmeric
Correct answer is option 'A'. Can you explain this answer?
Which of the following in not a natural indicator?
a)
Phenolphthalein
b)
Rose petals
c)
Litmus
d)
Turmeric
|
Krish Chawla answered |
Indicators are substances that give different colour with acid and base. Litmus, turmeric and rose petals are natural indicators while phenolphthalein is a artificial indicator.
What is the final color of lemon juice when tested with China rose indicator?- a)Dark pink (magenta)
- b)Green
- c)No change
- d)Blue
Correct answer is option 'A'. Can you explain this answer?
a)
Dark pink (magenta)
b)
Green
c)
No change
d)
Blue
|
Rainbow Rise Classes answered |
Lemon juice is acidic, so when tested with China rose indicator, it will turn dark pink (magenta). This color change indicates the acidic nature of the solution, as China rose turns acidic solutions to dark pink.
Antacids contain -- a)Strong acid
- b)Weak base
- c)Strong base
- d)Weak acid
Correct answer is option 'B'. Can you explain this answer?
Antacids contain -
a)
Strong acid
b)
Weak base
c)
Strong base
d)
Weak acid
|
Kaavya Menon answered |
Antacids are weak bases which are given when a patient is suffering from acidity.
The found in bites and strings of insect is- a)Lactic acid
- b)Tartaric acid
- c)Formic acid
- d)Citric acid
Correct answer is option 'C'. Can you explain this answer?
The found in bites and strings of insect is
a)
Lactic acid
b)
Tartaric acid
c)
Formic acid
d)
Citric acid
|
Arindam Kumar answered |
Formic acid is found in bites of strings of insect which cause burning sensation at the site of bite.
What new substance is formed as a result of a neutralization reaction between hydrochloric acid and sodium hydroxide?- a)Carbon dioxide
- b)Sodium chloride
- c)Oxygen gas
- d)Hydrogen gas
Correct answer is option 'B'. Can you explain this answer?
What new substance is formed as a result of a neutralization reaction between hydrochloric acid and sodium hydroxide?
a)
Carbon dioxide
b)
Sodium chloride
c)
Oxygen gas
d)
Hydrogen gas
|
|
Rainbow Rise Classes answered |
In the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), the new substance formed is sodium chloride (NaCl), commonly known as table salt. This salt is produced along with water (H2O) as the products of the reaction, highlighting the typical outcome of a neutralization process between an acid and a base.
On adding phenolphthalein indicator to a colourless solution, no change is observed. The nature of the solution may be- a)acidic or basic
- b)basic
- c)acidic or neutral
- d)basic or neutral
Correct answer is option 'C'. Can you explain this answer?
On adding phenolphthalein indicator to a colourless solution, no change is observed. The nature of the solution may be
a)
acidic or basic
b)
basic
c)
acidic or neutral
d)
basic or neutral
|
Shiksha Academy answered |
Since phenolphthalein turns pink in a basic solution and remains colourless in acidic and neutral solutions, if there's no change observed upon its addition, the solution must be either acidic or neutral.
What is the color change of turmeric paper when dipped into a basic solution?
- a)Blue
- b)Red
- c)Yellow
- d)Green
Correct answer is option 'B'. Can you explain this answer?
What is the color change of turmeric paper when dipped into a basic solution?
a)
Blue
b)
Red
c)
Yellow
d)
Green
|
Subset Academy answered |
Turmeric paper turns red when dipped into a basic solution, indicating the basic nature of the substance.
How can you identify a sugar solution, hydrochloric acid, and sodium hydroxide using turmeric indicator?- a)Sugar solution turns turmeric red, hydrochloric acid turns it yellow, sodium hydroxide does not change color.
- b)Sugar solution does not change color, hydrochloric acid turns it yellow, sodium hydroxide turns it red.
- c)Sugar solution turns turmeric red, hydrochloric acid remains unchanged, sodium hydroxide turns it yellow.
- d)Sugar solution turns turmeric yellow, hydrochloric acid turns it red, sodium hydroxide remains unchanged.
Correct answer is option 'B'. Can you explain this answer?
a)
Sugar solution turns turmeric red, hydrochloric acid turns it yellow, sodium hydroxide does not change color.
b)
Sugar solution does not change color, hydrochloric acid turns it yellow, sodium hydroxide turns it red.
c)
Sugar solution turns turmeric red, hydrochloric acid remains unchanged, sodium hydroxide turns it yellow.
d)
Sugar solution turns turmeric yellow, hydrochloric acid turns it red, sodium hydroxide remains unchanged.
|
Tutorpedia Coaching answered |
Using turmeric indicator, a sugar solution will not change color, hydrochloric acid will remain unchanged, and sodium hydroxide will turn the turmeric indicator red due to its basic nature.
What substance is commonly used to treat excessively acidic soil?- a)Quick lime (calcium oxide)
- b)Vinegar
- c)Baking soda
- d)Compost
Correct answer is option 'A'. Can you explain this answer?
a)
Quick lime (calcium oxide)
b)
Vinegar
c)
Baking soda
d)
Compost
|
Coachify answered |
Excessively acidic soil is treated with bases like quick lime (calcium oxide) or slaked lime (calcium hydroxide). These substances neutralize the acidity of the soil, improving its suitability for plant growth.
Complete the following analogy: Turmeric: Indicator:: Milk of magnesia:
- a)Strong acid
- b)Antacid
- c)Antidote for sting
- d)Hydrated salt
Correct answer is option 'B'. Can you explain this answer?
Complete the following analogy: Turmeric: Indicator:: Milk of magnesia:
a)
Strong acid
b)
Antacid
c)
Antidote for sting
d)
Hydrated salt
|
Seema singh answered |
Antacid
Milk of magnesia is to antacid as turmeric is to indicator.
- Similarity: Both milk of magnesia and turmeric serve a specific purpose in the field of chemistry.
- Function: Turmeric is commonly used as a natural indicator to determine the acidity or alkalinity of a substance. Similarly, milk of magnesia is used as an antacid to neutralize excess stomach acid and provide relief from heartburn and indigestion.
- Acid-Base Balance: Turmeric changes color in the presence of acids and bases, indicating the pH of a solution. Milk of magnesia, on the other hand, helps to balance the pH in the stomach by neutralizing excess acid.
- Chemical Properties: Turmeric contains curcumin, which reacts with acids and bases to produce different colors. Milk of magnesia contains magnesium hydroxide, which reacts with stomach acid to form magnesium chloride and water, thereby reducing acidity.
In conclusion, just as turmeric is commonly used as an indicator to detect acids and bases, milk of magnesia serves as an antacid to alleviate symptoms of acidity in the stomach. Both substances play important roles in maintaining chemical balance within the body and in laboratory settings.
Milk of magnesia is to antacid as turmeric is to indicator.
- Similarity: Both milk of magnesia and turmeric serve a specific purpose in the field of chemistry.
- Function: Turmeric is commonly used as a natural indicator to determine the acidity or alkalinity of a substance. Similarly, milk of magnesia is used as an antacid to neutralize excess stomach acid and provide relief from heartburn and indigestion.
- Acid-Base Balance: Turmeric changes color in the presence of acids and bases, indicating the pH of a solution. Milk of magnesia, on the other hand, helps to balance the pH in the stomach by neutralizing excess acid.
- Chemical Properties: Turmeric contains curcumin, which reacts with acids and bases to produce different colors. Milk of magnesia contains magnesium hydroxide, which reacts with stomach acid to form magnesium chloride and water, thereby reducing acidity.
In conclusion, just as turmeric is commonly used as an indicator to detect acids and bases, milk of magnesia serves as an antacid to alleviate symptoms of acidity in the stomach. Both substances play important roles in maintaining chemical balance within the body and in laboratory settings.
What happens if you put a drop of soap solution on turmeric paper?- a)The paper turns blue
- b)The paper remains yellow
- c)The paper turns red
- d)The paper turns green
Correct answer is option 'C'. Can you explain this answer?
What happens if you put a drop of soap solution on turmeric paper?
a)
The paper turns blue
b)
The paper remains yellow
c)
The paper turns red
d)
The paper turns green
|
Tanishq Dasgupta answered |
Explanation:
Turmeric paper is used as an indicator to test for acidity and alkalinity. When a drop of soap solution is put on turmeric paper, the following reaction occurs:
Alkaline Reaction:
- The soap solution is alkaline in nature.
- Turmeric paper is yellow in neutral or acidic conditions.
- When an alkaline substance like soap solution is added to turmeric paper, it causes a chemical reaction.
- The alkaline soap solution changes the color of turmeric paper from yellow to red.
- This change in color indicates the alkalinity of the soap solution.
Therefore, the correct answer is option 'c) The paper turns red'.
Turmeric paper is used as an indicator to test for acidity and alkalinity. When a drop of soap solution is put on turmeric paper, the following reaction occurs:
Alkaline Reaction:
- The soap solution is alkaline in nature.
- Turmeric paper is yellow in neutral or acidic conditions.
- When an alkaline substance like soap solution is added to turmeric paper, it causes a chemical reaction.
- The alkaline soap solution changes the color of turmeric paper from yellow to red.
- This change in color indicates the alkalinity of the soap solution.
Therefore, the correct answer is option 'c) The paper turns red'.
State whether the following statement is True or False:China rose indicator turns acidic solutions to dark pink (magenta) and basic solutions to green.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
State whether the following statement is True or False:
China rose indicator turns acidic solutions to dark pink (magenta) and basic solutions to green.
a)
True
b)
False
|
|
Rainbow Rise Classes answered |
- China rose indicator is like a magic potion that helps us know if a liquid is sour or sweet. When China rose meets something sour, like lemon juice, it turns the color to dark pink. But if it meets something sweet, like soda water, it changes to green.
- So, when China rose indicator meets acidic solutions, it turns them dark pink (magenta). When it meets basic solutions, it changes them to green. That's why the statement is True!
Vitamin C is the another name of
- a)Tartaric acid
- b)Citric acid
- c)Acetic acid
- d)Ascorbic acid
Correct answer is option 'D'. Can you explain this answer?
Vitamin C is the another name of
a)
Tartaric acid
b)
Citric acid
c)
Acetic acid
d)
Ascorbic acid
|
Kavya Rane answered |
Vitamin C is also known as ascorbic acid. It is a water-soluble vitamin that is necessary for normal growth and development. It is an antioxidant that helps maintain skin, blood vessels, bones and cartilage. It's also known to boost your immune system.
Tartaric acid, Citric acid, and Acetic acid are different types of acids and are not associated with Vitamin C. Tartaric acid is commonly found in grapes and bananas, Citric acid is naturally present in citrus fruits, and Acetic acid is a key component in vinegar.
Tartaric acid, Citric acid, and Acetic acid are different types of acids and are not associated with Vitamin C. Tartaric acid is commonly found in grapes and bananas, Citric acid is naturally present in citrus fruits, and Acetic acid is a key component in vinegar.
The correct answer is Ascorbic acid.
Which of the following acid is present in Tomato?- a)Oxalic acid
- b)Tartaric acid
- c)Phosphoric acid
- d)Lactic acid
Correct answer is option 'A'. Can you explain this answer?
Which of the following acid is present in Tomato?
a)
Oxalic acid
b)
Tartaric acid
c)
Phosphoric acid
d)
Lactic acid
|
Jambada Krishnamurthy answered |
Actually tomato contains oxalic acid.
tamarind contains tartaric acid
phosphoric is used for fertilizers, detergents and soft drinks
lactic acid is produced when you do exercises i.e the muscle cells and red blood cells produces lactic acid
so we can conclude that oxalic acid is present in tomato
tamarind contains tartaric acid
phosphoric is used for fertilizers, detergents and soft drinks
lactic acid is produced when you do exercises i.e the muscle cells and red blood cells produces lactic acid
so we can conclude that oxalic acid is present in tomato
Which of the following is not a base?
- a)Magnesium hydroxide
- b)Calcium hydroxide
- c)Hydrocholric acid
- d)Sodium hydroxide
Correct answer is option 'C'. Can you explain this answer?
Which of the following is not a base?
a)
Magnesium hydroxide
b)
Calcium hydroxide
c)
Hydrocholric acid
d)
Sodium hydroxide
|
Gunjan Lakhani answered |
Calcium carbonate is a salt, while all other are bases.
What does phenolphthalein indicate when the solution is basic?- a)It turns dark pink
- b)It turns green
- c)It remains colourless
- d)It turns blue
Correct answer is option 'A'. Can you explain this answer?
What does phenolphthalein indicate when the solution is basic?
a)
It turns dark pink
b)
It turns green
c)
It remains colourless
d)
It turns blue
|
Vp Classes answered |
When phenolphthalein is added to a basic solution, it changes its color to dark pink. This change helps us know if a solution is basic or not. So, when you see the pink color, you can tell that the solution is basic.
State whether the following statement is True or FalseAcids taste sour and bases taste bitter.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
State whether the following statement is True or False
Acids taste sour and bases taste bitter.
a)
True
b)
False
|
Bespoke Classes answered |
- True! Acids like curd, lemon juice, orange juice, and vinegar taste sour because they contain acids.
- On the other hand, bases like baking soda taste bitter.
- So, acids usually have a sour taste, while bases have a bitter taste.
- When you taste something sour like lemon juice, it might have acids in it.
- And if something tastes bitter like baking soda, it could be a base.
- Remember, sour for acids and bitter for bases!
Acid rain is created when substances like ___________ mix with raindrops in the air.- a)Oxygen, Carbon dioxide
- b)Sulphur dioxide, Nitrogen dioxide
- c)Hydrogen, Sulphur dioxide
- d)Nitrogen dioxide, Hydrogen
Correct answer is option 'B'. Can you explain this answer?
Acid rain is created when substances like ___________ mix with raindrops in the air.
a)
Oxygen, Carbon dioxide
b)
Sulphur dioxide, Nitrogen dioxide
c)
Hydrogen, Sulphur dioxide
d)
Nitrogen dioxide, Hydrogen
|
Raksha Roy answered |
Understanding Acid Rain
Acid rain is a significant environmental issue resulting from human activities and natural processes. It occurs when certain pollutants mix with rainwater, leading to harmful effects on ecosystems, buildings, and human health.
Key Pollutants
The primary substances responsible for acid rain are:
Formation of Acid Rain
When sulphur dioxide and nitrogen dioxide mix with raindrops in the atmosphere, the following reactions occur:
These acids dissolve in the rainwater, resulting in acid rain, which has a lower pH than normal rainwater.
Effects of Acid Rain
Acid rain can lead to various detrimental effects, including:
In summary, option 'B' is correct as sulphur dioxide and nitrogen dioxide are the key substances that contribute to the formation of acid rain, making it a pressing environmental concern.
Acid rain is a significant environmental issue resulting from human activities and natural processes. It occurs when certain pollutants mix with rainwater, leading to harmful effects on ecosystems, buildings, and human health.
Key Pollutants
The primary substances responsible for acid rain are:
- Sulphur Dioxide (SO2): This gas is released from burning fossil fuels, such as coal and oil, and from industrial processes. When it enters the atmosphere, it can combine with oxygen and water vapor to form sulfuric acid.
- Nitrogen Dioxide (NO2): This pollutant comes from vehicle emissions and power plants. It reacts with water vapor in the air to produce nitric acid.
Formation of Acid Rain
When sulphur dioxide and nitrogen dioxide mix with raindrops in the atmosphere, the following reactions occur:
- Formation of Sulfuric Acid: SO2 reacts with oxygen and water to form H2SO4 (sulfuric acid).
- Formation of Nitric Acid: NO2 reacts with water to form HNO3 (nitric acid).
These acids dissolve in the rainwater, resulting in acid rain, which has a lower pH than normal rainwater.
Effects of Acid Rain
Acid rain can lead to various detrimental effects, including:
- Damage to forests and vegetation.
- Acidification of lakes and rivers, harming aquatic life.
- Corrosion of buildings and monuments, especially those made of limestone and marble.
- Negative impacts on soil chemistry, affecting agriculture.
In summary, option 'B' is correct as sulphur dioxide and nitrogen dioxide are the key substances that contribute to the formation of acid rain, making it a pressing environmental concern.
What is the role of bases in treating factory wastes?- a)They make the waste more acidic
- b)They have no effect on the waste
- c)They neutralize the acid in the waste
- d)They increase the toxicity of the waste
Correct answer is option 'C'. Can you explain this answer?
What is the role of bases in treating factory wastes?
a)
They make the waste more acidic
b)
They have no effect on the waste
c)
They neutralize the acid in the waste
d)
They increase the toxicity of the waste
|
Praveen Kumar answered |
Bases are used to neutralize acidic wastes in factories before disposal, preventing harm to aquatic organisms.
Sour things contain- a)Salts
- b)Neutral
- c)Bases
- d)Acids
Correct answer is option 'D'. Can you explain this answer?
Sour things contain
a)
Salts
b)
Neutral
c)
Bases
d)
Acids
|
Pallabi Saha answered |
Sour things contain acids. All organic acid obtained from plants and animals are sour in taste. Mineral acids should not be tasted.
What is the pH nature of distilled water?- a)Acidic
- b)Basic
- c)Neutral
- d)Saline
Correct answer is option 'C'. Can you explain this answer?
a)
Acidic
b)
Basic
c)
Neutral
d)
Saline
|
|
Coachify answered |
Distilled water is neutral, with a pH of around 7. It does not change the color of either blue or red litmus paper, which signifies its neutral nature.
What happens in a neutralization reaction?- a)An acid reacts with another acid to form a base and water.
- b)A base reacts with another base to form an acid and water.
- c)An acid reacts with a base to form salt and water.
- d)An acid reacts with a base to form only salt.
Correct answer is option 'C'. Can you explain this answer?
a)
An acid reacts with another acid to form a base and water.
b)
A base reacts with another base to form an acid and water.
c)
An acid reacts with a base to form salt and water.
d)
An acid reacts with a base to form only salt.
|
|
Vp Classes answered |
In a neutralization reaction, an acid reacts with a base to form salt and water. This process is characterized by the combination of H⁺ ions from the acid and OH⁻ ions from the base to form water (H₂O), and the remaining ions form a salt.
Why is it important to neutralize factory wastes before disposal into water bodies?- a)To enhance the aesthetic value of the water
- b)To increase the nutrient content of the water
- c)To prevent the killing of aquatic organisms due to acid
- d)To speed up the decomposition of organic matter
Correct answer is option 'C'. Can you explain this answer?
a)
To enhance the aesthetic value of the water
b)
To increase the nutrient content of the water
c)
To prevent the killing of aquatic organisms due to acid
d)
To speed up the decomposition of organic matter
|
|
Vp Classes answered |
Factory wastes often contain acids, which can harm aquatic organisms by disrupting the water’s pH balance. Neutralizing these wastes before disposal helps protect the aquatic ecosystem by preventing the acid from causing harm.
Turmeric stains turns into ___________ when washed with soap.- a)Blue
- b)Green
- c)Orange
- d)Red
Correct answer is option 'D'. Can you explain this answer?
Turmeric stains turns into ___________ when washed with soap.
a)
Blue
b)
Green
c)
Orange
d)
Red
|
Mahesh Sen answered |
Turmeric strains on clothes turn into red when washed with soap. Soap is basic in nature and reacts with turmeric to give red colour in presence of water.
Which base is commonly used to treat acidic soil?- a)Sodium Hydroxide
- b)Potassium Hydroxide
- c)Ammonium Hydroxide
- d)Calcium Hydroxide
Correct answer is option 'D'. Can you explain this answer?
Which base is commonly used to treat acidic soil?
a)
Sodium Hydroxide
b)
Potassium Hydroxide
c)
Ammonium Hydroxide
d)
Calcium Hydroxide
|
|
Praveen Kumar answered |
Acidic soil is treated with bases like slaked lime (calcium hydroxide) to neutralize its acidic nature.
How does milk of magnesia provide relief from indigestion?
- a)It increases acidity
- b)It neutralizes hydrochloric acid and acts as a base
- c)It acts as a salt
- d)It promotes digestion
Correct answer is option 'B'. Can you explain this answer?
How does milk of magnesia provide relief from indigestion?
a)
It increases acidity
b)
It neutralizes hydrochloric acid and acts as a base
c)
It acts as a salt
d)
It promotes digestion
|
|
Praveen Kumar answered |
Milk of magnesia, being a base, neutralizes excess hydrochloric acid in the stomach, providing relief from indigestion.
What is the role of an antacid such as milk of magnesia in treating indigestion?- a)It increases the acidity in the stomach
- b)It helps to digest food more quickly
- c)It neutralizes the excessive acid in the stomach
- d)It provides a temporary relief without affecting acidity
Correct answer is option 'C'. Can you explain this answer?
a)
It increases the acidity in the stomach
b)
It helps to digest food more quickly
c)
It neutralizes the excessive acid in the stomach
d)
It provides a temporary relief without affecting acidity
|
|
Kavya kulkarni answered |
Role of Milk of Magnesia in Treating Indigestion
Indigestion is caused by excessive acid production in the stomach, leading to symptoms such as bloating, discomfort, and heartburn. Antacids like milk of magnesia play a crucial role in alleviating these symptoms.
Neutralizing Excessive Acid
- Milk of magnesia contains magnesium hydroxide, which works by neutralizing the excessive acid in the stomach.
- By raising the pH level in the stomach, milk of magnesia helps to reduce the burning sensation and discomfort caused by indigestion.
Providing Relief
- Milk of magnesia provides quick relief from symptoms of indigestion, such as acid reflux and bloating.
- It helps to soothe the lining of the stomach and esophagus, reducing inflammation and discomfort.
Temporary Relief
- While milk of magnesia provides temporary relief from indigestion symptoms, it does not address the underlying cause of excessive acid production.
- It is important to consult a healthcare provider if indigestion symptoms persist or worsen, as they could be indicative of a more serious condition.
In conclusion, milk of magnesia plays a vital role in treating indigestion by neutralizing excessive acid in the stomach and providing temporary relief from symptoms. It is a commonly used antacid that can help alleviate discomfort associated with indigestion.
Indigestion is caused by excessive acid production in the stomach, leading to symptoms such as bloating, discomfort, and heartburn. Antacids like milk of magnesia play a crucial role in alleviating these symptoms.
Neutralizing Excessive Acid
- Milk of magnesia contains magnesium hydroxide, which works by neutralizing the excessive acid in the stomach.
- By raising the pH level in the stomach, milk of magnesia helps to reduce the burning sensation and discomfort caused by indigestion.
Providing Relief
- Milk of magnesia provides quick relief from symptoms of indigestion, such as acid reflux and bloating.
- It helps to soothe the lining of the stomach and esophagus, reducing inflammation and discomfort.
Temporary Relief
- While milk of magnesia provides temporary relief from indigestion symptoms, it does not address the underlying cause of excessive acid production.
- It is important to consult a healthcare provider if indigestion symptoms persist or worsen, as they could be indicative of a more serious condition.
In conclusion, milk of magnesia plays a vital role in treating indigestion by neutralizing excessive acid in the stomach and providing temporary relief from symptoms. It is a commonly used antacid that can help alleviate discomfort associated with indigestion.
What do we call substances that do not change the color of either red or blue litmus paper?- a)Acids
- b)Bases
- c)Neutral solutions
- d)Indicators
Correct answer is option 'C'. Can you explain this answer?
What do we call substances that do not change the color of either red or blue litmus paper?
a)
Acids
b)
Bases
c)
Neutral solutions
d)
Indicators
|
|
Bespoke Classes answered |
Neutral solutions are substances that do not change the color of either red or blue litmus paper. This means they are neither acidic nor basic.
Acid present in soured curd is- a)Lactic acid
- b)Acetic acid
- c)Tartaric acid
- d)Oxalic add
Correct answer is option 'A'. Can you explain this answer?
Acid present in soured curd is
a)
Lactic acid
b)
Acetic acid
c)
Tartaric acid
d)
Oxalic add
|
Rohini Seth answered |
The curd is produced due to the presence of reaction between lactic acid bacteria and the milk protein casein. When milk sugar or lactose undergoes fermentation, the product obtained is lactic acid.
Which acid is commonly found in vinegar?- a)Acetic acid
- b)Citric acid
- c)Lactic acid
- d)Oxalic acid
Correct answer is option 'A'. Can you explain this answer?
Which acid is commonly found in vinegar?
a)
Acetic acid
b)
Citric acid
c)
Lactic acid
d)
Oxalic acid
|
|
Gunjan Lakhani answered |
Acetic acid is the acid commonly found in vinegar. It is a weak acid that gives vinegar its characteristic sour taste and pungent smell. Acetic acid is also widely used in the food industry for pickling and preserving food items.
What is the chemical name of common salt formed during the neutralization of sodium hydroxide and hydrochloric acid?- a)Sodium Chloride
- b)Sodium Hydroxide
- c)Hydrochloric Acid
- d)Sodium Bicarbonate
Correct answer is option 'A'. Can you explain this answer?
What is the chemical name of common salt formed during the neutralization of sodium hydroxide and hydrochloric acid?
a)
Sodium Chloride
b)
Sodium Hydroxide
c)
Hydrochloric Acid
d)
Sodium Bicarbonate
|
Rishabh Nair answered |
Chemical Name of Common Salt Formed during Neutralization of Sodium Hydroxide and Hydrochloric Acid:
When sodium hydroxide (NaOH) and hydrochloric acid (HCl) react together in a neutralization reaction, a chemical compound called sodium chloride (NaCl) is formed. Sodium chloride is commonly known as table salt.
Neutralization Reaction:
The reaction between sodium hydroxide and hydrochloric acid can be represented by the following balanced chemical equation:
NaOH + HCl → NaCl + H2O
In this reaction, one molecule of sodium hydroxide reacts with one molecule of hydrochloric acid to produce one molecule of sodium chloride and one molecule of water.
Explanation:
- Sodium hydroxide (NaOH) is a strong base, and hydrochloric acid (HCl) is a strong acid. When these two substances react together, they undergo a neutralization reaction.
- In a neutralization reaction, an acid reacts with a base to form a salt and water. The acidity of the acid is neutralized by the basicity of the base, resulting in the formation of a neutral product.
- In the case of the reaction between sodium hydroxide and hydrochloric acid, the sodium ion (Na+) from sodium hydroxide combines with the chloride ion (Cl-) from hydrochloric acid to form sodium chloride (NaCl).
- The other product of the reaction is water (H2O), which is formed by the combination of the hydrogen ion (H+) from hydrochloric acid and the hydroxide ion (OH-) from sodium hydroxide.
- Sodium chloride is a white crystalline solid that is highly soluble in water. It is widely used as a seasoning and preservative in food, as well as in various industrial processes.
- The chemical formula for sodium chloride is NaCl, where Na represents sodium and Cl represents chlorine.
Conclusion:
The chemical name of the common salt formed during the neutralization of sodium hydroxide and hydrochloric acid is sodium chloride (NaCl). This reaction is a typical example of a neutralization reaction, where a salt and water are produced by the combination of an acid and a base. Sodium chloride, or table salt, is widely used in various applications due to its numerous properties and uses.
When sodium hydroxide (NaOH) and hydrochloric acid (HCl) react together in a neutralization reaction, a chemical compound called sodium chloride (NaCl) is formed. Sodium chloride is commonly known as table salt.
Neutralization Reaction:
The reaction between sodium hydroxide and hydrochloric acid can be represented by the following balanced chemical equation:
NaOH + HCl → NaCl + H2O
In this reaction, one molecule of sodium hydroxide reacts with one molecule of hydrochloric acid to produce one molecule of sodium chloride and one molecule of water.
Explanation:
- Sodium hydroxide (NaOH) is a strong base, and hydrochloric acid (HCl) is a strong acid. When these two substances react together, they undergo a neutralization reaction.
- In a neutralization reaction, an acid reacts with a base to form a salt and water. The acidity of the acid is neutralized by the basicity of the base, resulting in the formation of a neutral product.
- In the case of the reaction between sodium hydroxide and hydrochloric acid, the sodium ion (Na+) from sodium hydroxide combines with the chloride ion (Cl-) from hydrochloric acid to form sodium chloride (NaCl).
- The other product of the reaction is water (H2O), which is formed by the combination of the hydrogen ion (H+) from hydrochloric acid and the hydroxide ion (OH-) from sodium hydroxide.
- Sodium chloride is a white crystalline solid that is highly soluble in water. It is widely used as a seasoning and preservative in food, as well as in various industrial processes.
- The chemical formula for sodium chloride is NaCl, where Na represents sodium and Cl represents chlorine.
Conclusion:
The chemical name of the common salt formed during the neutralization of sodium hydroxide and hydrochloric acid is sodium chloride (NaCl). This reaction is a typical example of a neutralization reaction, where a salt and water are produced by the combination of an acid and a base. Sodium chloride, or table salt, is widely used in various applications due to its numerous properties and uses.
Which synthetic indicator is commonly used to test the acidic or basic nature of a substance?- a)Litmus
- b)Turmeric
- c)China rose
- d)Phenolphthalein
Correct answer is option 'D'. Can you explain this answer?
Which synthetic indicator is commonly used to test the acidic or basic nature of a substance?
a)
Litmus
b)
Turmeric
c)
China rose
d)
Phenolphthalein
|
Eduskill Classes answered |
Phenolphthalein is a synthetic indicator commonly used in laboratories to test the acidic or basic nature of a substance. It changes color based on the pH of the solution.
What color does litmus paper turn when added to an acidic solution?- a)Green
- b)Red
- c)Blue
- d)Yellow
Correct answer is option 'B'. Can you explain this answer?
What color does litmus paper turn when added to an acidic solution?
a)
Green
b)
Red
c)
Blue
d)
Yellow
|
|
Subset Academy answered |
Litmus paper turns red when added to an acidic solution. This color change is a result of the acidic nature of the solution, which causes the litmus paper to shift its color to red. It is a simple and effective way to test for acidity using a natural indicator like litmus.
What is the role of organic matter in treating basic soil?- a)It neutralizes the acidity of the soil
- b)It releases acids that neutralize the basic nature of the soil
- c)It increases the soil's alkalinity
- d)It improves the soil's drainage
Correct answer is option 'B'. Can you explain this answer?
a)
It neutralizes the acidity of the soil
b)
It releases acids that neutralize the basic nature of the soil
c)
It increases the soil's alkalinity
d)
It improves the soil's drainage
|
|
Rainbow Rise Classes answered |
Organic matter, such as compost, releases acids when decomposed. These acids help to neutralize the basic nature of the soil, making it more suitable for plant growth.
What is the color change of red litmus paper when dipped in a basic solution?- a)Yellow
- b)Green
- c)Blue
- d)Purple
Correct answer is option 'C'. Can you explain this answer?
What is the color change of red litmus paper when dipped in a basic solution?
a)
Yellow
b)
Green
c)
Blue
d)
Purple
|
Namita joshi answered |
Red litmus paper is a type of indicator paper that is used to test the acidity or alkalinity of a solution. It is made from a water-soluble dye that is extracted from lichens.
When red litmus paper is dipped in a basic solution, it undergoes a color change from red to blue. This is due to the chemical reaction that occurs between the basic solution and the dye on the litmus paper.
Explanation:
- Basic solutions have a pH greater than 7. They contain a higher concentration of hydroxide ions (OH-) compared to hydrogen ions (H+).
- The dye on the red litmus paper is a weak acid. It has a red color in its acidic form and a blue color in its basic form.
- When the red litmus paper is dipped in a basic solution, the hydroxide ions from the solution react with the acidic dye on the paper.
- This reaction causes the dye to lose a hydrogen ion (H+) and gain a hydroxide ion (OH-).
- As a result, the dye molecule is converted into its basic form, which has a blue color.
- This color change is visible on the litmus paper, indicating that the solution is basic.
Importance of red litmus paper:
- Red litmus paper is a widely used indicator in chemistry labs and in various industries.
- It is a simple and inexpensive way to determine whether a solution is acidic or basic.
- The color change of red litmus paper when dipped in a basic solution provides a visual indication of the solution's pH.
- It helps in identifying the nature of a solution and is an important tool for conducting experiments and tests.
In conclusion, when red litmus paper is dipped in a basic solution, it changes color from red to blue. This color change is due to the reaction between the basic solution and the acidic dye on the litmus paper. It is a useful indicator to determine the pH of a solution and plays an important role in various scientific applications.
When red litmus paper is dipped in a basic solution, it undergoes a color change from red to blue. This is due to the chemical reaction that occurs between the basic solution and the dye on the litmus paper.
Explanation:
- Basic solutions have a pH greater than 7. They contain a higher concentration of hydroxide ions (OH-) compared to hydrogen ions (H+).
- The dye on the red litmus paper is a weak acid. It has a red color in its acidic form and a blue color in its basic form.
- When the red litmus paper is dipped in a basic solution, the hydroxide ions from the solution react with the acidic dye on the paper.
- This reaction causes the dye to lose a hydrogen ion (H+) and gain a hydroxide ion (OH-).
- As a result, the dye molecule is converted into its basic form, which has a blue color.
- This color change is visible on the litmus paper, indicating that the solution is basic.
Importance of red litmus paper:
- Red litmus paper is a widely used indicator in chemistry labs and in various industries.
- It is a simple and inexpensive way to determine whether a solution is acidic or basic.
- The color change of red litmus paper when dipped in a basic solution provides a visual indication of the solution's pH.
- It helps in identifying the nature of a solution and is an important tool for conducting experiments and tests.
In conclusion, when red litmus paper is dipped in a basic solution, it changes color from red to blue. This color change is due to the reaction between the basic solution and the acidic dye on the litmus paper. It is a useful indicator to determine the pH of a solution and plays an important role in various scientific applications.
Why does rubbing baking soda over the skin provide relief from ant or bee stings?- a)It numbs the area
- b)It neutralizes the injected acid
- c)It attracts the insects
- d)It causes an allergic reaction
Correct answer is option 'B'. Can you explain this answer?
Why does rubbing baking soda over the skin provide relief from ant or bee stings?
a)
It numbs the area
b)
It neutralizes the injected acid
c)
It attracts the insects
d)
It causes an allergic reaction
|
|
Subset Academy answered |
Baking soda, being a base, neutralizes the formic acid injected by ants or bees, providing relief from the pain of the sting.
The word acid comes from Latin word “acere” which means- a)Bitter
- b)Sour
- c)Sweet
- d)Salty
Correct answer is option 'B'. Can you explain this answer?
The word acid comes from Latin word “acere” which means
a)
Bitter
b)
Sour
c)
Sweet
d)
Salty
|
|
Rainbow Rise Classes answered |
The word acid comes from Latin word acere which means Sour. Acids are sour in taste.
Why is neutralization considered an exothermic reaction?- a)It absorbs heat
- b)It releases heat
- c)It remains at constant temperature
- d)It depends on the nature of acid and base
Correct answer is option 'B'. Can you explain this answer?
Why is neutralization considered an exothermic reaction?
a)
It absorbs heat
b)
It releases heat
c)
It remains at constant temperature
d)
It depends on the nature of acid and base
|
|
Praveen Kumar answered |
Neutralization reactions are exothermic because they release heat during the formation of the neutral solution.
How does an ant bite affect the skin, and what can neutralize this effect?- a)The bite injects a basic liquid, which can be neutralized with vinegar
- b)The bite injects an acidic liquid, which can be neutralized with baking soda or calamine solution
- c)The bite injects a neutral liquid, which does not need treatment
- d)The bite injects a saline solution, which can be neutralized with salt
Correct answer is option 'B'. Can you explain this answer?
a)
The bite injects a basic liquid, which can be neutralized with vinegar
b)
The bite injects an acidic liquid, which can be neutralized with baking soda or calamine solution
c)
The bite injects a neutral liquid, which does not need treatment
d)
The bite injects a saline solution, which can be neutralized with salt
|
Keystone Instructors answered |
An ant bite injects formic acid, which is acidic. This effect can be neutralized by applying moist baking soda (sodium hydrogencarbonate) or calamine solution (zinc carbonate), both of which are basic and counteract the acidity.
Topic in NCERT: Ant bite
Line in NCERT: "When an ant bites, it injects the acidic liquid (formic acid) into the skin. The effect of the acid can be neutralised by rubbing moist baking soda (sodium hydrogencarbonate) or calamine solution, which contains zinc carbonate."
The reaction in which an acid react with a base to form salt and water is called as- a)Addition reaction
- b)Displacement reaction
- c)Neutralisation reaction
- d)Substitution reaction
Correct answer is option 'C'. Can you explain this answer?
The reaction in which an acid react with a base to form salt and water is called as
a)
Addition reaction
b)
Displacement reaction
c)
Neutralisation reaction
d)
Substitution reaction
|
|
Praveen Kumar answered |
The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water.
What is the result of the neutralization reaction between hydrochloric acid and sodium hydroxide?- a)Hydrogen Gas
- b)Oxygen
- c)Carbon Dioxide
- d)Water
Correct answer is option 'D'. Can you explain this answer?
What is the result of the neutralization reaction between hydrochloric acid and sodium hydroxide?
a)
Hydrogen Gas
b)
Oxygen
c)
Carbon Dioxide
d)
Water
|
Partho Basu answered |
The result of the neutralization reaction between hydrochloric acid and sodium hydroxide is water. This reaction is a typical example of an acid-base reaction, where an acid and a base react to form a salt and water.
Neutralization Reaction:
In a neutralization reaction, the hydrogen ions (H+) from the acid combine with the hydroxide ions (OH-) from the base to form water (H2O). The remaining ions from the acid and base combine to form a salt. In this case, the salt formed is sodium chloride (NaCl).
Chemical Equation:
The chemical equation for the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:
HCl + NaOH → NaCl + H2O
The hydrochloric acid donates a hydrogen ion (H+) to the sodium hydroxide, resulting in the formation of water and sodium chloride.
Explanation:
During the reaction, the hydrochloric acid dissociates into hydrogen ions (H+) and chloride ions (Cl-). Similarly, sodium hydroxide dissociates into sodium ions (Na+) and hydroxide ions (OH-).
The hydrogen ions from the hydrochloric acid combine with the hydroxide ions from the sodium hydroxide to form water molecules. This is an exothermic reaction, releasing energy in the form of heat.
The remaining ions, sodium (Na+) and chloride (Cl-), combine to form sodium chloride (NaCl), which is a salt. The salt remains dissolved in the water, forming a homogeneous solution.
Conclusion:
In conclusion, the neutralization reaction between hydrochloric acid and sodium hydroxide results in the formation of water and sodium chloride. This reaction is commonly used in various applications, such as in the laboratory to prepare solutions of specific pH or in everyday life for acid-base neutralization.
Neutralization Reaction:
In a neutralization reaction, the hydrogen ions (H+) from the acid combine with the hydroxide ions (OH-) from the base to form water (H2O). The remaining ions from the acid and base combine to form a salt. In this case, the salt formed is sodium chloride (NaCl).
Chemical Equation:
The chemical equation for the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:
HCl + NaOH → NaCl + H2O
The hydrochloric acid donates a hydrogen ion (H+) to the sodium hydroxide, resulting in the formation of water and sodium chloride.
Explanation:
During the reaction, the hydrochloric acid dissociates into hydrogen ions (H+) and chloride ions (Cl-). Similarly, sodium hydroxide dissociates into sodium ions (Na+) and hydroxide ions (OH-).
The hydrogen ions from the hydrochloric acid combine with the hydroxide ions from the sodium hydroxide to form water molecules. This is an exothermic reaction, releasing energy in the form of heat.
The remaining ions, sodium (Na+) and chloride (Cl-), combine to form sodium chloride (NaCl), which is a salt. The salt remains dissolved in the water, forming a homogeneous solution.
Conclusion:
In conclusion, the neutralization reaction between hydrochloric acid and sodium hydroxide results in the formation of water and sodium chloride. This reaction is commonly used in various applications, such as in the laboratory to prepare solutions of specific pH or in everyday life for acid-base neutralization.
Which natural indicator is extracted from Lichens and comes in the form of strips of two colors - blue and red?- a)Turmeric
- b)China Rose
- c)Methyl Orange
- d)Litmus
Correct answer is option 'D'. Can you explain this answer?
Which natural indicator is extracted from Lichens and comes in the form of strips of two colors - blue and red?
a)
Turmeric
b)
China Rose
c)
Methyl Orange
d)
Litmus
|
|
Subset Academy answered |
Litmus is extracted from Lichens and comes in the form of strips of two colors - blue litmus paper and red litmus paper.
What is the chemical nature of substances that taste sour and are corrosive in nature?- a)Salty
- b)Basic
- c)Neutral
- d)Acidic
Correct answer is option 'D'. Can you explain this answer?
What is the chemical nature of substances that taste sour and are corrosive in nature?
a)
Salty
b)
Basic
c)
Neutral
d)
Acidic
|
|
Praveen Kumar answered |
Substances that taste sour and are corrosive in nature are called acids. The chemical nature of such substances is known as acidic.
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