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Test: Important Chemical Compounds - 2 - Class 10 MCQ


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20 Questions MCQ Test Science Class 10 - Test: Important Chemical Compounds - 2

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Test: Important Chemical Compounds - 2 - Question 1

What is the defining characteristic of salts?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 1
The defining characteristic of salts is that they are soluble in water and have a salty taste. Salts are ionic compounds composed of positively charged ions (cations) and negatively charged ions (anions). When dissolved in water, salts dissociate into their constituent ions, giving the solution a salty taste.
Test: Important Chemical Compounds - 2 - Question 2

What is the pH of a salt formed by a strong acid and a weak base?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 2
When a strong acid and a weak base combine to form a salt, the resulting compound will be acidic with a pH less than 7. This is because the presence of a strong acid will dominate the weak base, resulting in an overall acidic compound.
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Test: Important Chemical Compounds - 2 - Question 3

Which compound can be created from common salt, sodium chloride (NaCl), and is commonly known as caustic soda?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 3
Sodium hydroxide, also known as caustic soda, is one of the compounds that can be created from common salt, sodium chloride (NaCl). It is a strong base with various industrial and household applications, including in soap making, paper production, and water treatment.
Test: Important Chemical Compounds - 2 - Question 4
In the family of salts, when salts have the same cation or anion, how are they categorized?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 4
Salts are categorized as members of the same family when they have either the same cation or anion. This classification simplifies the study of salts by grouping together compounds that share common cations or anions, aiding in understanding their properties and behavior.
Test: Important Chemical Compounds - 2 - Question 5
What is the pH of a salt formed by a weak acid and a strong base?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 5
When a weak acid and a strong base combine to form a salt, the resulting compound will be basic with a pH greater than 7. In this case, the strong base will dominate the weak acid, leading to an overall basic nature of the salt.
Test: Important Chemical Compounds - 2 - Question 6
What is the primary purpose of the chlor-alkali process?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 6
The chlor-alkali process is primarily aimed at producing sodium hydroxide through the electrolysis of an aqueous solution of sodium chloride. This process is crucial for various industries, including the production of soaps, detergents, and paper.
Test: Important Chemical Compounds - 2 - Question 7
What is the common characteristic shared by all acids and bases?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 7
Acids and bases can be classified as electrolytes, meaning they can conduct electricity when dissolved in water. This property is fundamental to their behavior in various chemical reactions and is a key characteristic that distinguishes them from other types of substances.
Test: Important Chemical Compounds - 2 - Question 8

When acids are dissolved in water, what ions do they produce?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 8

Acids produce H+ ions when dissolved in water. These ions are essential to the acidic properties of the solution and play a significant role in various acid-base reactions.

Test: Important Chemical Compounds - 2 - Question 9

What happens when a base is dissolved in water?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 9

When a base is dissolved in water, it produces OH- ions. These hydroxide ions are responsible for the basic properties of the solution and are involved in neutralizing acids in chemical reactions.

Test: Important Chemical Compounds - 2 - Question 10
Why is it recommended to add acid to water when diluting acids instead of adding water to acid?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 10
It is advised to add acid to water when diluting acids because the process of dissolving an acid or a base in water is highly exothermic, meaning it releases a significant amount of heat. Adding water to acid could lead to rapid heating and potential splattering, while adding acid to water allows for better control of the reaction and minimizes the risk of accidents.
Test: Important Chemical Compounds - 2 - Question 11

What does a pH value of 7 indicate about a solution?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 11

A pH value of 7 indicates that the solution is neutral. The pH scale is a measure of the concentration of H+ ions in a solution. A pH of 7 signifies a neutral solution, where the concentration of H+ ions is balanced.

Test: Important Chemical Compounds - 2 - Question 12

How is the strength of an acid or base estimated using a universal indicator?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 12

The strength of an acid or base can be estimated using a universal indicator by observing the color change of the indicator. Universal indicator is a mixture of several indicators that display different colors at different concentrations of H+ ions in the solution. This color change helps in determining whether the solution is acidic, basic, or neutral.

Test: Important Chemical Compounds - 2 - Question 13

What is the general chemical equation for the reaction between a metallic oxide and an acid?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 13

The general chemical equation for the reaction between a metallic oxide and an acid is Metallic oxide + Acid → Salt + Water. This reaction typically results in the formation of a salt and water. For example, when calcium oxide (CaO) reacts with hydrochloric acid (HCl), it produces calcium chloride (CaCl2) and water (H2O).

Test: Important Chemical Compounds - 2 - Question 14

How do metallic oxides generally react with bases?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 14

Metallic oxides generally react with bases to produce a salt and water. When a metallic oxide, such as ZnO, reacts with a base like sodium hydroxide (NaOH), it can result in the formation of a salt like sodium zinc oxide (Na2ZnO2) and water (H2O).

Test: Important Chemical Compounds - 2 - Question 15
Which type of oxides are metallic oxides, based on their nature?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 15
Metallic oxides are basic in nature. This means that they tend to react with acids to form salts and water. For example, ZnO is considered a basic oxide as it reacts with bases to produce salts and water.
Test: Important Chemical Compounds - 2 - Question 16

What is the product of the reaction between ZnO and sodium hydroxide (NaOH)?

Detailed Solution for Test: Important Chemical Compounds - 2 - Question 16

When ZnO reacts with sodium hydroxide (NaOH), the resulting product is sodium zinc oxide, represented by the chemical formula Na2ZnO2. This reaction demonstrates the basic nature of metallic oxides like ZnO when they react with bases to form salts and water.

Test: Important Chemical Compounds - 2 - Question 17
When a non-metallic oxide reacts with a base, what is the general outcome in terms of products?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 17
When a non-metallic oxide reacts with a base, the general result is the formation of salt and water. This reaction is a characteristic property of non-metallic oxides, which are acidic in nature. This chemical process helps in neutralizing the acidic properties of the non-metallic oxides by reacting with the basic properties of the base, leading to the formation of salt and water as the final products.
Test: Important Chemical Compounds - 2 - Question 18
Which type of reaction occurs when a base reacts with a non-metallic oxide?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 18
When a base reacts with a non-metallic oxide, the typical outcome is the formation of salt and water. Bases have the ability to neutralize the acidic properties of non-metallic oxides by reacting with them, leading to the production of salt and water as the final products. This chemical reaction helps in balancing the pH levels and stabilizing the properties of the substances involved.
Test: Important Chemical Compounds - 2 - Question 19
Which of the following reactions involving acids results in the production of salt, carbon dioxide, and water?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 19
When an acid reacts with a metal carbonate, the chemical reaction results in the formation of salt, carbon dioxide, and water. This reaction is a characteristic property of acids, where the carbonate compound reacts with the acid to produce these specific products. The evolution of carbon dioxide gas during this reaction is often observable as bubbles, indicating the release of the gas.
Test: Important Chemical Compounds - 2 - Question 20
What is the primary result when a base reacts with an acid?
Detailed Solution for Test: Important Chemical Compounds - 2 - Question 20
When a base reacts with an acid, the primary outcome is the formation of salt and water. This reaction is a fundamental property of bases and acids when they neutralize each other's properties. The formation of salt and water signifies the completion of the chemical reaction between the acidic and basic components, resulting in a more stable and neutralized solution.
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