Percentage compositionn of hydrogen in benzene is _____

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Solution

The correct option is B
Benzene is $C_{6} H_{6}$ . Molecular mass $= (12 \times 6) + (6 \times 1) = 78 u$

$%$ composition of Hydrogen = $\frac{6}{78}$ $\times 100$

$= 7.692 %$

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