A gaseous mixture contains \( \mathrm{O}_{2} \) and \( \mathrm{N}_{...

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A gaseous mixture contains \( \mathrm{O}_{2} \) and \( \mathrm{N}_{2} \) in the ratio
P \( 1: 4 \) by weight. Then the ratio of their number of
W. molecules in the mixture is
(A) \( 3: 32 \)
(B) \( 7: 32 \)
(C) \( 1: 4 \)
(D) \( 3: 16 \)
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