Q.

H2S gas is used in qualitative analysis of inorganic cations. Its solubility in water at STP is 0.195 mol Kg-1. Thus, Henry's law constant  (in atm molal-1) for H2S is

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a

2.628×10-4

b

5.128

c

0.185

d

3.826×103

answer is B.

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Detailed Solution

By Henry's law, p=KH χ=KH S    (where, S = solubility) ∴KH=pS=1 atm0.195 mol kg-1                        =5.128 atm kg mol-1
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