If average molecular wt. of air is 29, then assuming $N_{2}$ and $O_{2}$ gases are there which options are correct regarding composition of air:
i) 75% by mass of $N_{2}$
ii) 75% by moles $N_{2}$
iii) 72.41% by mass of $N_{2}$

only (i) is correct

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only (ii) is correct

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both (ii) and (iii) are correct

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both (i) and (ii) are correct

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Solution

The correct option is B only (i) is correct
Average wt. air is $29$ $N i t r o g e n = \frac{x}{10} \times 29 x = 75 %$

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