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Mole Concept

The vapour de...

Question

The vapour density of gas A is four times that of B. If molecular mass of B is M, then the molecular mass of A is :

M

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4 M

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M / 4

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2 M

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Solution

The correct option is B $4 M$
As, Molecular mass = 2 $\times$ Vapour density
Given, $V D_{A} = 4 V D_{B}$
$M W_{A} = 2 V D_{A} = 2 \times 4 V D_{B}$
$⟹ M W_{A} = 8 \times \frac{M W_{B}}{2} = 4 M$

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