Select the correct answer from each of the following questions: The vapour density of certain g...

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Select the correct answer from each of the following questions:

The vapour density of certain gas \( X \) is 4 times that of \( Y \). The molecular mass of \( X \) is \( M \). The molecular mass of \( \mathrm{Y} \) is
(A) \( 4 \mathrm{M} \)
(B) \( 0.5 \mathrm{M} \)
(C) \( 0.25 \mathrm{M} \)
(D) \( 0.33 \mathrm{M} . \)
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