Question

Identify the option (s) which is/are not correct w.r.t the solubility of a gas in water.

• A. Value of $K_H$ (Henry's constant ) will decrease as the temperature increases
• B. Value of $K_H$ (Henry's constant) at same temperature for $O_2$ gas will be less as compared to $H_2$ gas
• C. Soft drinks will have greater "fizz" if sealed under low pressure
• D. Scuba divers when they move underwater will have increased solubility of gases in their blood

Answer 1

Answer: (A), (C)

The correct options are
A Value of $K_H$ (Henry's constant ) will decrease as the temperature increases
C Soft drinks will have greater "fizz" if sealed under low pressure

(A) Value of Henry's constant is basically given by $\frac{\text{pressure}}{\text{solubility}}$. On increasing temperature solubility decreases, thus $K_H$ will increase.

(B) Solubility of $O_2$ is higher than $H_2$ at same tempeature, thus the $K_H$ value will be less for $O_2$ compared to $H_2$.

(C) If sealed under low pressure, less $C{O}_2$ will evolve because the amount of $C{O}_2$ dissolved was less, because the solubility of gas increases with increase in pressure.

(D) Under water, due to high pressure, solubility of gases will also be high.