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Question

Vapour density of a volatile substance is 4 in comparison to methane (CH4 =1). Its molecular mass will be:

A
8
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B
2
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C
64
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D
128
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Solution

The correct option is A 8
Vapour density is the density of vapour in relation to that of Hydrogen.
Vapour density =Molar mass of gas2
Vapour density =4
Then,
4=Molar mass of gas2
8= Molar mass of gas

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