Assertion :A gas effuses out from a flask through an orifice (pinhole); rate of effusion decreases linearly with time. Reason: Pressure of the gas in the flask decreases with passage of time.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$Graham's law of diffusion :$
An gas effuses out from a flash through an orifice( pin-hole), rate of effusion decreases linearly.
with time, $r a t e = \frac{Q u a n t i t y}{T i m e}$
As time increases, rate decreases.
Also, pressure of gas decreases with passes of time, as the gas starts coming but of orifice.

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