The correct order of normal boiling points of O2,N2,NH3 and CH4 for whom the values of vander waals constant 'a' are 1.360, 1.390, 4.170 and 2.253 L2 atm. 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 vander waals constant 'a' are
1.360, 1.390, 4.170 and 2.253 L2 atm. mol−2
respectively) is O2<N2<CH4<NH3. Higher is the value of van der waals constant a, higher will be the boiling point as a is an indirect measure of the magnitude of attractive forces between the molecules.