MCQ Questions

Question 1

Neutralisation reaction is a :

1. Physical and reversible change
2. Physical change which is not reversible
3. Chemical and reversible change
4. Chemical change which is not reversible

Answer: 

Neutralisation reaction is a chemical reaction between an acid and a base that produces salt and water. 

It is irreversible in nature.

Therefore the answer is (d).

Question 2

The acid present in Amla is:

1. Malic acid
2. Tartaric acid
3. Citric acid
4. Ascorbic acid

Answer:

Amla contains Ascorbic acid in it.

Therefore the answer is (d).

Question 3

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions respectively are:

1. Red and blue
2. Blue and red
3. Pink and colourless
4. Colourless and pink

Answer:

Phenolphthalein is an indicator that changes its colour to pink when exposed to a basic solution.

When an acidic solution is added to it, it experiences no change in colour.

Therefore the answer is (d)

Question 4

The correct way of making a solution of acid in water is:

1. Add water to acid
2. Add acid to water
3. Mix acid and water simultaneously
4. Add water to acid in shallow container

Answer:  

• We should always very carefully add acid to water .
• Diluting an acidic or basic solution is a reaction that produces a lot of heat .
• Mixing acid and water simultaneously or adding water to acid could actually trigger a blast of water and acid on the user.

Therefore the answer is (b).