Q.

The vapour density of a gas is given by:

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a

V.D.= mass of N molecules of gas  mass of N molecules of H2

b

V.D.= Molar mass/2 

c

none of the above

d

V.D.= mass of 1 mole of gas  mass of 1 mole of H2

answer is A, B, C.

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Detailed Solution

Vapour Density of a gas =  Density of the gas  Density of Hydrogen                                              =  Mass of certain volume of the gas atSTPMass of the same volume of H                                             = Mass of certain volume of the gas atSTPMass of the same volume of H                                              = Mass of 1molecule of the gas Mass of 1molecule of hydrogen gas                                            =Molecular mass2

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