The solubility of the gas in a liquid :
(A) Increases with increase in pressure
(B) Decreases with increase in pressure
(C) Increases with increase in temperature
(D) Decreases with increase in temperature
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (D) only
(A) Increases with increase in pressure — True. By Henry’s law the solubility of a gas is directly proportional to its partial pressure above the solution (p = KHx).
(B) Decreases with increase in pressure — False. This contradicts Henry’s law.
(C) Increases with increase in temperature — False. Dissolution of a gas is exothermic (like condensation), so by Le Chatelier’s principle higher temperature lowers the solubility; KH increases with temperature.
(D) Decreases with increase in temperature — True. For the same reason, gases are less soluble in warm water (aquatic animals are more comfortable in cold water).
NCERT (2026-27 edition):
Solubility of a Gas in a Liquid – “… The dissolution of a gas in a liquid is governed by Henry’s law, according to which, at a given temperature, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas.”
Solubility of a Gas in a Liquid – “… Solubility of gases in liquids decreases with rise in temperature. When dissolved, the gas molecules are present in liquid phase and the process of dissolution can be considered similar to condensation and heat is evolved in this process.”