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NEET levelSingle correct optionDifficulty 1 of 3ig061

When a gas is collected over water, the pressure of the dry gas is obtained from the total pressure by

Aadding the aqueous tension
Bsubtracting the aqueous tension
Cmultiplying by the aqueous tension
Dno correction is needed

Answer: B

The collected gas is saturated with water vapour. By Dalton's law

P_{total} = p_{dry gas} + p_{H X_{2} O}

, so

p_{dry gas} = P_{total} -

aqueous tension.

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