5   L of an alkane requires 25   L of oxygen for its complete combustion. If all volumes are…

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
  1. Isobutane
  2. Ethane
  3. Butane
  4. Propane

Solution

Combustion of Hydrocarbon,

CxHy+x+y4O2→x CO2+y2H2O

∴ n∝v (P,T=Constant)

for 1 mole of CxHy=x+y4, O2 required

for 5 L of CxHy=x+y4 5 L, O2 required

∴ ratio of alkane and O2 is 5/25

So, x+y45=25

    x+y4=5,

which is satisfied by C3H8.
 

Asked in: JEE Main 2016 (09 Apr Online)

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