Ncert Exercises & Solutions

K_H value for Ar(g), CO₂ (g), HCHO (g) and CH₄(g) are 40.39, 1.67, 1.83 × $10^{- 5}$ and 0.413 respectively.

Arrange these gases in the order of their increasing solubility.

1. HCHO < CH₄ < CO₂ < Ar

2. HCHO < CO₂ < CH₄ < Ar

3. Ar < CO₂ < CH₄ < HCHO

4. Ar < CH₄ < CO₂ < HCHO

(c) Value of K_H depends upon nature of gases dissolved in water.

Gas

Temperature (K)

K_H/k bar

CO₂

CH₄

HCHO

298 K

40.3

1.67

0.413

1.83 x 10^-5

Hence,correct order is Ar < CO₂ < CH₄ < HCHO and correct choice is (c).