Which one of the following statements is correct with reference to the solubility of gases in liquid?

The solubility of gases in liquids increases with the increase of pressure.

The correct answer is Option (1) → The solubility of gases in liquids increases with the increase of pressure.

• The solubility of gases in liquids follows Henry’s Law, which states that:
• At constant temperature, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.
• Mathematically: p = KH × x
• Where p = partial pressure of the gas
• x = mole fraction of the gas in the solution
• KH = Henry’s law constant
• Thus, when pressure increases, more gas dissolves in the liquid, increasing solubility.
• Temperature also affects solubility. Generally, solubility of gases decreases with increase in temperature because gases escape from solution when heated.

Option 1 The solubility of gases in liquids increases with the increase of pressure. Correct.

According to Henry’s law, solubility increases with increasing pressure.

Option 2 The solubility of gases in liquids is not affected with the increase of temperature. Incorrect. Temperature significantly affects gas solubility.

Option 3 The solubility of gases in liquids increases with the increase of temperature. Incorrect.

In most cases, gas solubility decreases when temperature increases.

Option 4 At high altitude, the partial vapour pressure of O₂ becomes greater than that at the sea level. Incorrect.

At high altitude, atmospheric pressure is lower, so the partial pressure of oxygen is also lower.