Question 10 - MCQs from NCERT Exemplar - Chapter 2 Class 10 - Acids, Bases and Salts

Sodium hydrogen carbonate when added to acetic acid evolves a gas.

Which of the following statements are true about how the gas evolved?

(i) It turns lime water milky (ii) It extinguishes a burning splinter

(iii) It dissolves in a solution of sodium hydroxide (iv) It has a pungent odour

(A) (i) and (ii) 

(B) (i), (ii) and (iii)

(C) (ii), (iii) and (iv) 

(D) (i) and (iv)

Answer

When sodium hydroxide reacts with acetic acid, it produces Carbon Dioxide (CO ₂ ) gas.

And we know that

• Carbon dioxide turns lime water milky . 
• CO ₂ works as a fire extinguisher, so it can extinguish the burning candle or splinter 
• And Carbon Dioxide gets dissolved in sodium hydroxide solution to form sodium carbonate
• But, Carbon dioxide gas is odourless in nature.

Thus, statement (i), (ii), (iii) are correct, the last statement is false

So, the correct answer is (b) - (i), (ii) and (iii)