Question 4 - MCQs from Past Year Papers - Chapter 4 Class 10 - Carbon and its Compounds

Last updated at July 25, 2026 by

When sodium hydrogen carbonate is added to ethanoic acid a gas evolves. Consider the following statements about the gas evolved.

(a) It turns lime water milky.

(b) It is evolved with a brisk effervescence.

(c) It has a smell of burning Sulphur.

(d) It is also a by-product of respiration.

The correct statements are:

(a) (A) and (B) only

(b) (B) and (D) only

(c) (A), (C) and (D)

(d) (A), (B) and (D)

 

Answer

When sodium hydrogen carbonate (NaHCO 3 ) reacts with ethanoic acid, the following reaction takes place and CO 2 gas is evolved:

Reaction of Sodium hydrogen carbonate with Ethanoic acid - Teachoo.png

                      

Now,

  • CO 2 turns lime water milky
  • It is evolved with brisk effervescence 
  • And it is also a by-product of respiration.

Checking the options:

  • (A) It turns lime water milky - This is correct.
  • (B) It is evolved with a brisk effervescence - This is correct.
  • (C) It has a smell of burning Sulphur - This is not correct.
  • (D) It is also a by-product of respiration - This is correct.

Therefore, the correct answer is (d) - (A), (B) and (D)

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Transcript

When sodium hydrogen carbonate is added to ethanoic acid a gas evolves. Consider the following statements about the gas evolved. (a) It turns lime water milky. (b) It is evolved with a brisk effervescence. (c) It has a smell of burning Sulphur. (d) It is also a by-product of respiration. The correct statements are: (a) (A) and (B) only (b) (B) and (D) only (c) (A), (C) and (D) (d) (A), (B) and (D) Answer When sodium hydrogen carbonate (NaHCO3) reacts with ethanoic acid, the following reaction takes place and CO2 gas is evolved: Reaction of Sodium hydrogen carbonate with Ethanoic acid CH3COOH NaHCO3 CH3COONa H2O CO2 (Sodium bicarbonate) (Sodium hydrogen carbonate) Sodium ethanoate Now, CO2 turns lime water milky It is evolved with brisk effervescence And it is also a by-product of respiration. Checking the options: (A) It turns lime water milky - This is correct. (B) It is evolved with a brisk effervescence - This is correct. (C) It has a smell of burning Sulphur - This is not correct. (D) It is also a by-product of respiration - This is correct. Therefore, the correct answer is (d) - (A), (B) and (D)

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