Which of the statement are true?

Options

A. Law of constant compositon is true for all types of compounds.
B. Molar volume of a gas at standard conditions is `22.4 L`.
C. vapour density of a gas is twice of its molecula mass.
D. Atomic masses of most elements are fractional.

Answer

D

Explanation

a. Not applicable if the elements exists in different isotopes which may be involved in the formation of compound.
b. At 1 atm, `25^(@)C` molar volume `= 22.7 L`
c. `Mw = 2 xx VD`,
Due ot existance of isotopes.