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Q)

10ml of gaseous hydrocarbon requires 30ml of oxygen for complete combustion.The hydrocarbon is

$\begin{array}{1 1}(a)\;C_2H_4&(b)\;C_2H_2\\(c)\;C_2H_6&(d)\;C_3H_6\end{array}$

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A)
10ml hydrocarbon requires 30ml oxygen
$\therefore$ 1ml hydrocarbon requires 3ml oxygen
$\therefore$ Hydrocarbon is $C_2H_4$
$C_2H_4+3O_2\rightarrow 2CO_2+2H_2O$
Hence (a) is the correct answer.
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