Olympiad Test: Acids Bases & Salts
20 Questions MCQ Test | Olympiad Test: Acids Bases & Salts
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a.Lemon juice in its natural state is acidic with a pH of about 2, but once metabolized it actually becomes alkaline with a pH well above 7. So, outside the body, anyone can see that lemon juice is very acidic.
b.Tomatoes and tomato products are packed with malic and citric acid, both which can make the stomach produce too much gastric acid. Tomatoes can make your gastric acid levels rise high enough to make it force back up the esophagus.
c.Milk — pasteurized, canned, or dry — is an acid-forming food. Its pH level is below neutral at about 6.7 to 6.9. This is because it contains lactic acid.
Sodium hydroxide is found in base. Sodium hydroxide (NaOH) is a strong base.
Sodium chloride is a salt that do not brings any change to litmus paper or other indicator.
Sodium hydroxide is a strong base and highly corrosive in nature.
Sour things contain acids. All organic acid obtained from plants and animals are sour in taste. Mineral acids should not be tasted.
In cold drinks or soft drinks carbonic acid is present. When carbon dioxide gas is filled in a container at high pressure over water carbonic acid is formed.
Those substances that give different colour with acid and base are called indicator. Methyl orange, litmus and phenolphthalein is indicator but not the sodium chloride.
Water soluble bases are called alkalise. All bases are not soluble in water. Sodium hydroxide is a water soluble base.
Turmeric stains turns into ___________ when washed with soap.
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.
All acids produce __________ ions in presence of water.
All acids produce hydrogen ions (H+) in presence of water and all bases produce OH− ions.
The reaction in which an acid react with a base to form salt and water is called as
The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water.
Which of the following in not a natural indicator?
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.
Vitamin C, also known as ascorbic acid and l-ascorbic acid, is a vitamin found in various foods and sold as a dietary supplement. It is used to prevent and treat scurvy. Vitamin C is an essential nutrient involved in the repair of tissue and the enzymatic production of certain neurotransmitters. It is required for the functioning of several enzymes and is important for immune system function. It also functions as an antioxidant.
The acids obtained from plants and animals are called organic acid while those manufactured by us in laboratory are called mineral acids.
When metal oxide reacts with water bases are formed as metal oxides are basic in nature
The word acid comes from Latin word “acere” which means
The word acid comes from Latin word acere which means Sour. Acids are sour in taste.
Dry HCl gas do not change the colour of dry litmus paper because
Acids shows acidic character only in presence of water by producing hydrogen ions. So, dry HCl gas do not change the colour of dry litmus paper.
When blue litmus paper is dipped in acids, the litmus turns red in presence of water.
Formic acid is found in bites of strings of insect which cause burning sensation at the site of bite.
Which of the following does not form an acidic salt?
Carbonic acid is a weak acid ( acid salt contain strong acid ,strong base)
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