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H(2)S gas is used in qualitative analysi...

`H_(2)S` 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 `H_(2)S` is

A

`2.628xx10^(-4)`

B

`5.128`

C

`0.185`

D

`3.826xx10^(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
By,Henry's law,
`rho=K_(H)chi=K_(H)S` (where,S = solubility)
`:. K_(H)=(p)/(S)=(1 "atm")/(0.19 "mol kg"^(-1))`
`=5.128 "atm kg mol"^(-1)`
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