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Question

At a particular temperature, for the same partial pressures, the value of KH (Henry’s constant) in water for O2 is smaller than that of N2. Which of the following is correct?

A
N2 is more soluble in water
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B
O2 is more soluble in water
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C
Solubility is independent of KH
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D
Both are equally soluble
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Solution

The correct option is B O2 is more soluble in water
According to Henry's law that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid.
P=KH C
P = Partial pressure, KH = Henry's constant and C = concentration of dissolved gas.
Since partial pressure is equal for both the gases, value of KH is small for O2 because it is more soluble in water than N2

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