A mixture contains \( \mathrm{N}_{2} \mathrm{O}_{4} \) and \( \mathrm{NO}_{2} \) in the ratio \(...

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A mixture contains \( \mathrm{N}_{2} \mathrm{O}_{4} \) and \( \mathrm{NO}_{2} \) in the ratio \( 2: 1 \) by volume. The vapour density of the mixture is
(A) \( 49.8 \)
(B) \( 38.3 \)
(C) \( 32.6 \)
(D) \( 45.4 \)
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