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  4. 5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is :

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Q. 5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is :

JEE MainJEE Main 2016Some Basic Concepts of Chemistry

Solution:

Combustion of Hydrocarbon:
$C_{x}H_{y}+\left(X+\frac{y}{4}\right)O_{2}\rightarrow X\,CO_{2}+\frac{y}{2}H_{2}O$
$1\, : \left(X+\frac{y}{4}\right)$
$\therefore x=\frac{y}{4}=5$ which is satisfied by $C_3H_8$ (Propane)