Question

Question 10.
Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about 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 1

When sodium hydrogen carbonate is added to acetic acid then carbon dioxide $\left({\text{CO}}_2\right)$ gas is evolved.

$\underset{\text{Sodium hydrogen carbonate}}{{\text{NaHCO}}_3}+\underset{\text{Acetic acid}}{{\text{CH}}_3\text{COOH}}⟶\underset{\text{Sodium acetate}}{{\text{CH}}_3\text{COONa}}+{\text{CO}}_2+{\text{H}}_2\text{O}$

${\text{CO}}_2$ turns lime water milky, does not support combustion, is absorbed by strong alkalies like NaOH and does not have any smell.