The vapour density of a gas \( \mathrm{A} \) is twice that of a gas...

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The vapour density of a gas \( \mathrm{A} \) is twice that of a gas
P B. If the molecular weight of \( B \) is \( \mathrm{M} \), the molecular

W. weight of \( \mathrm{A} \) will be :
(A) \( \mathrm{M} \)
(B) \( 2 \mathrm{M} \)
(C) \( 3 \mathrm{M} \)
(D) \( \mathrm{M} / 2 \)
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