Assertion : Molecular weight of a compound is $180$ , if its vapour density is $90$ .
Reason : $Molecular weight = \frac{Vapour density}{2}$

If both assertion and reason are true and reason is the correct explaination of assertion

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If both assertion and reason are true and reason is not the correct explaination of assertion

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If assertion is true but reason is false

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If both assertion and reason are false

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Solution

The correct option is C If assertion is true but reason is false
$Vapour density (V.D.) = \frac{Molecular weight}{2}$
$∴ Molecular weight = 2 \times vapour density of gas$

Hence the correct answer is option (c).

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