Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume X diffuses twice as fast as another perfume Y; what is the molecular weight of Y, if the vapor density of gas X is 2? Molecular weight of gas X is to be assumed to be 2 ?
A. 16
B. 2
C. 4
D. 8
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