Class 12 chemistry PYQ solution chapter

 Q3: K_H value for some gases at the same temperature 'T' are given (NEET 2022)

where K_H is Henry's Law constant in water. The order of their solubility in water is :
(a) HCHO < CH₄ < CO₂ < Ar 
(b) Ar < CO₂ < CH₄ < HCHO 
(c) Ar < CH₄ < CO₂ < HCHO 
(d) HCHO < CO₂ < CH₄ < Ar 

Ans: (b)

                                                   Explanation video in tamil language

According to Henry's Law,
p = K_Hx
Where 'p' is partial pressure of gas in vapour phase.
K_H is Henry's Law constant.
'x' is mole fraction of gas in liquid.
Higher the value of K_H at a given pressure, lower is the solubility of the gas in the liquid.
∴ Solubility : Ar < CO₂ < CH₄ < HCHO