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Question

Vapour density of a gas A is three times that of gas B. If the molecular mass of B is X, the molecular mass of A is:

A
X
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B
3X
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C
X3
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D
1.5X
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Solution

The correct option is B 3X
Vapour density of a gas A is three times that of gas B. If the molecular mass of B is X, the molecular mass of A is 3X.

Note: The molecular mass is twice the vapour density. Hence, the ratio of molecular masses is equal to the ratio of vapour densities.

If the vapour density of a gas A is three times that of gas B, then the molecular mass of gas A is also three times that of gas B.

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