CBSE Class 10 Science MCQs Chapter 2 Acids Bases and Salts

1) Alkalis are

1. acids, which are soluble in water
2. acids, which are insoluble in water
3. bases, which are insoluble in water
4. bases, which are soluble in water

Answer 4

2) Which of the following acids are edible

(a) Citric acid

(b) Tartaric acid

(c) Hydrochloric acid

(d) Carbonic acid

1. (A) and (B) are correct
2. (A), (B) and (D) are correct
3. (A), (B) and (C) are correct
4. All are correct

Answer 2

3) Two aqueous solutions P and Q have pH of 5 and 13 respectively. The correct inference is that:

1. solution P is of HCl and Q is of NH4OH
2. solution P is of CH3COOH and Q is of Ca(OH)2
3. solution P is of HNO3 and Q is of NH4OH
4. solution P is of CH3COOH and Q is of NaOH

Answer 4

4) Which of the following phenomena occur when a small amount of acid is added to water?

i. Ionisation

ii. Neutralisation

iii. Dilution

iv. Salt formation

1. (i) and (ii)
2. (i) and (iii)
3. (ii) and (iii)
4. (ii) and (iv)

Answer. 2. (i) and (iii)

5) Methyl orange is

1. Pink in acidic medium, yellow in basic medium
2. Yellow in acidic medium, pink in basic medium
3. Colourless in acidic medium, pink in basic medium
4. Pink in acidic medium, colourless in basic medium.

Answer 1

6) What is the pH value of sodium chloride?

1. 7
2. More than 7
3. Less than 7
4. Zero

Answer 1

7) Rain is called acid rain when its:

1. pH falls below 7
2. pH falls below 6
3. pH falls below 5.6
4. pH is above 7

Answer 3

8) Which one of the following can be used as an acid-base indicator by a visually impaired student?

1. Litmus
2. Turmeric
3. Vanilla Essence
4. Petunia Leaves

Answer 3

9) A substance ‘A’ does not dissociate completely into its ions in aqueous solutions. It is bitter in taste and soapy to the touch. Identify substance A.

1. Weak base
2. Strong acid
3. Strong base
4. Weak acid

Answer 1

10) Sodium hydroxide turns into phenolphthalein solution 

1. pink 
2. yellow 
3. colourless 
4. orange

Answer 1

11) Sodium hydroxide turns into phenolphthalein solution 

1. pink 
2. yellow 
3. colourless
4. orange

Answer 3

12) Which of the following gives the correct increasing order of acidic strength?

Water < Acetic acid < Hydrochloric acid

1. Water < Hydrochloric acid < Acetic acid
2. Acetic acid < Water < Hydrochloric acid
3. Hydrochloric acid < Water < Acetic acid

Answer 1

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

(i) Temperature of the solution decreases

(ii) Temperature of the solution increases

(in) The temperature of the solution remains the same

(iv) Salt formation takes place

1. (i) and (iv)
2. (i) and (iii)
3. (ii) only
4. (ii) and (iv)

Answer 4

14) To protect against tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

1. Acidic
2. Neutral
3. Basic
4. Corrosive

Answer 3

15) pH of an aqueous solution is 4. Hydrogen ion concentration mol/litre of this solution is :

1. 4
2. 1.0 × 10-4
3. 10.
4. 1.0 × 104

Answer 4