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Q)

Substance is found to contain $7 \%$ nitrogen, The minimum molecular weight of it is

$(a)\;70 \\ (b)\;200 \\(c)\;100 \\(d)\;700 $

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A)
$100\;g$ of substance has $7\;g$ of nitrogen.
$\therefore \; xg$ of substance has $\large\frac{7}{100} \times $$xg$ of nitrogen
For minimum molecular weight, it must have at least one N atom.
$\therefore \large\frac{7}{100} $$\times x =14$
$x= \large\frac {14 \times 100}{7}$$=200$
Hence b is the correct answer.
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