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Assertion:1//4^(th) of the gas is expelled if air present in an open vessel is heated from 27^(@)C to 127^(@)C. Reason : Rate of diffusion of a gas is inversely proportional to the square root of its molecular mass.

Answer»

If both ASSERTION and reason are true and the reason is correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false

Solution :`(V_(1))/(T_(1))=(V_(2))/(T_(2))` ( initial fraction ) `(V_(1))/(V_(2))=1`when temperature is `27^(@)C`. At `127^(@)C` the newfraction is `(V_(1))/(V_(2))=(300)/(400)=(3)/(4) :. ` air expelled `implies 1-(3)/(4)=(1)/(4)`


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