Question 26
$K_{H}$ value for Ar (g), $C O_{2}$ (g), HCHO (g) and $C H_{4}$ (g) are 40.39, 1.67, $1.83 \times 10^{- 5}$ and 0.413 repectively.
Arrange these gases in the order of their increasing solubility.
(a) $H C H O < C H_{4} < C O_{2} < A r$ (b) $H C H O < C O_{2} < C H_{4} < A r$
(c) $A r < C O_{2} < C H_{4} < H C H O$ (d) $A r < C H_{4} < C O_{2} < H C H O$

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Solution

(C) Value of $K_{H}$ depends upon nature of gases dissolved in water.
$\begin{matrix} G a s & T e m p e r a t u r e (K) & K_{H} / K b a r A r & 298 K & 40.3 C O_{2} & 298 K & 1.67 C H_{4} & 298 K & 0.413 H C H O & 298 K & 1.83 \times 10^{-} 5 \end{matrix}$
Hence, correct order is $A r < C O_{2} < C H_{4} < H C H O$ and correct choice is (c).

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