Question

A gas $X$ when dissolved in water heat is evolved. Then solubility of $X$ will increase:

• A. low pressure, high temperature
• B. low pressure, low temperature
• C. high pressure, high temperature
• D. high pressure, low temperature

Answer 1

The correct option is D high pressure, low temperature

$X\left(g\right)+H_{2}O\rightleftharpoons X\left(aq\right);-\Delta H$

Using Le Chaterlier's principle:

when a system in equillibrium experiences a disturbance (such as concentration, temperature, or pressure changes), it will respond to restore a new equilibrium state by opposing the disturbance.

An exothermic process goes into forward direct when temperature is decreased and since in the given process the gas goes into water thereby results in decrease of pressure, hence an increase in pressure will shift the equillibrium forward.

Therefore option D is correct.