Q.

The value of γ=(CpCv), for hydrogen, helium and another ideal diatomic gas X (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to            [2019]
 

1 75,53,97  
2 53,75,97  
3 53,75,75  
4 75,53,75  

Ans.

(1)

γ=1+2n            ;       For H2, γ=1+25=75

For He, γ=1+23=53      ;       For X, γ=1+27=97