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Match the Cp/Cv ratio ideal gases with different types of molecules:

Molecular type  Cp/Cv
(A) monoatomic I- 7/5
(B) diatomic rigid molecules  II- 9/7
(C)  diatomic non- rigid molecules  III- 4/3
(D)  triatomic rigid molecules  IV - 5/3

 
Option: 1 A-IV , B-II, C-I, D-III
Option: 2 A-III, B-IV, C-II, D-I
Option: 3 A-IV, B-I, C-II, C-III
Option: 4 A-II, B-III, C-I, D-IV

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\gamma=\frac{C_{p}}{C_{v}}=1+\frac{2}{f} \\ \text{where 'f is degree of freedom }\\ (A) Mono \ \ atomic \\ \mathrm{f}=3, \gamma=1+\frac{2}{3}=\frac{5}{3} \\ (B) Diatomic \ \ rigid \ \ molecules, \\ \mathrm{f}=5, \gamma=1+\frac{2}{5}=\frac{7}{5} \\ (C) Diatomic \ \ non-rigid \ \ molecules \\ \mathrm{f}=7, \gamma=1+\frac{2}{7}=\frac{9}{7} \\ (D) Triatomic \ \ rigid \ \ molecules \\ \mathrm{f}=6, \gamma=1+\frac{2}{6}=\frac{4}{3}

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