(a) Match the following, if the molecular weights of X, Y and Z are the same. (b) C_v value of He is always 3R/2 bu

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Q 2660423315.     (a) Match the following, if the molecular weights of X, Y and Z are the same.

(b) C_v value of He is always 3R/2 but C_v, value of H, is 3R/2 at low temperature and 5R/2 at moderate temperature and more than 5R/2 at higher temperature. Explain the dependence on temperature and justify your answer in two to three lines.
JEE 2003 Mains

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