According to Henry’s law ‘the partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas (x) in the solution’. For different gases the correct statement about Henry’s constant is

According to Henry’s law, the solubility of the gas in a given volume of liquid at a constant temperature is directly proportional to the pressure of gas exerted on the liquid. The relation is stated as follows, H p = k x x Where, H k is Henry’s law constant, p is the partial pressure of the liquid and ‘x’ is the mole fraction. At constant pressure, the Henry’s law constant H k value is inversely proportional to the mole fraction ‘x’. SOLUTIONS 33 H 1 k x Therefore, the higher the value of H k the lower is the solubility of the gas. Thus, (b) is the correct option.