KH value for Ar(g), CO2 (g), HCHO (g) and CH4 (g) are 40.39, 1.67, 1.83 ×10–5 and 0.413 respectively.
Arrange these gases in the order of their increasing solubility.
1
HCHO < CH4 < CO2 < Ar
2
HCHO < CO2 < CH4 < Ar
3
Ar < CO2 < CH4 < HCHO
4
Ar < CH4 < CO2 < HCHO