The vapour density of a mixture containing \( \mathrm{NO}_{2} \) and \( \mathrm{N}_{2} \mathrm{O...

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The vapour density of a mixture containing \( \mathrm{NO}_{2} \) and \( \mathrm{N}_{2} \mathrm{O}_{4} \) is 27.6. The mole fraction of \( \mathrm{N}_{2} \mathrm{O}_{4} \) in the mixture is:
(a) \( 0.1 \)
(b) \( 0.2 \)
(c) \( 0.5 \)
(d) \( 0.8 \)
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