The correct order of normal boiling points of O2,N2,NH3 and CH4 for whom the values of van der Waal's constant ′a′ are 1.360,1.390,4.170 and2.253L2atm mol−2 respectively is :
A
O2<N2<NH3<CH4
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B
O2<N2<CH4<NH3
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C
NH3<CH4<N2<O2
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D
NH3<CH4<O2<N2
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Solution
The correct option is BO2<N2<CH4<NH3 The correct order of normal boiling points of O2,N2,NH3 and CH4, (for whom the values of van der Waal's constant ′a′ are 1.360,1.390,4.170 and2.253L2.atm mol−2 respectively) is O2<N2<CH4<NH3.
Higher is the value of van der Waal's constant a, higher will be the boiling point as a is an indirect measure of the magnitude of attractive forces between the molecules.