Assertion :When gaseous hydrocarbon are completely burnt in eudiometer tube with excess of $O_{2}$ and after cooling there is a contraction in the volume of gases. Reason: The volume of $H_{2} O$ is not considered.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$C_{x} H_{y} + (x + \frac{y}{4}) O_{2} \to x C O_{2} + \frac{y}{2} H_{2} O$

$1$ vol $(x + \frac{y}{4})$ vol $x$ vol

$V_{C o n t r a c t i o n} = V_{R} - V_{P} = [1 + (x + \frac{x}{4}) - x] = (1 + \frac{y}{4})$

The concentration in volume is due to the condensation of $H_{2} O$ vapour on cooling.

Hence, option A is correct.

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