The values of the Henry's law constant Ar,CO2,CH4andO2 in water at 25oC are 40.30, 1.67, 0.41 and 34.86 kbar respectively. The order of their solubility in water at the same temperature and pressure is
A
Ar>O2>CO2>CH4
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B
CH4>CO2>Ar>O2
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C
CH4>CO2>O2>Ar
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D
Ar>CH4>O2>CO2
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Solution
The correct option is CCH4>CO2>O2>Ar According to Henry's law, Pgas=KH×Xgas Xgas(molefraction)∝solubilityofgas∝1KH KH value for Ar,CO2,CH4andO2 are 40.30, 1.67, 0.41, 34.86 so solubility order is CH4>CO2>O2>Ar