NCERT Class X Science Class: Chapter –2. Acids, Bases and Salts – Part-1

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Multiple Choice Questions

Question 1:

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

  1. The temperature of the solution increases

  2. The temperature of the solution decreases

  3. The temperature of the solution remains the same

  4. Salt formation takes place

  5. (i) only

  6. (i) and (iii)

  7. (ii) and (iii)

  8. (i) and (iv)

Answer: D

Imageacid is mixed solution base in a test tube

Imageacid is Mixed Solution Base in a Test Tube

Question 2:

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

  1. Baking powder

  2. Lime

  3. Ammonium hydroxide solution

  4. Hydrochloric acid

Answer: D

Image litmus paper in acid and base

Image Litmus Paper in Acid and Base

Question 3:

During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

  1. Absorb the evolved gas

  2. Moisten the gas

  3. Absorb moisture from the gas

  4. Absorb ions from the evolved gas

Answer: C

Image guard tube containing calcium chloride

Image Guard Tube Containing Calcium Chloride

Question 4:

Which of the following salts does not contain water of crystallisation?

  1. Blue vitriol

  2. Baking soda

  3. Washing soda

  4. Gypsum

Answer: B

Imagethe baking soda

Imagethe Baking Soda

Question 5:

Sodium carbonate is a basic salt because it is a salt of

  1. Strong acid and strong base

  2. Weak acid and weak base

  3. Strong acid and weak base

  4. Weak acid and strong base

Answer: D

Image the Sodium carbonate

Image the Sodium Carbonate

Question 6:

Calcium phosphate is present in tooth enamel. Its nature is

  1. Basic

  2. Acidic

  3. Neutral

  4. Amphoteric

Answer: A

ImageCalcium phosphate is present in tooth enamel

ImageCalcium Phosphate is Present in Tooth Enamel

Question 7:

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

  1. Lemon juice

  2. Vinegar

  3. Common salt

  4. An antacid

Answer: D

Image An antacid

Image an Antacid

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