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Consider a mixture of n moles of helium gas and 2 n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its CP/CV value will be :

(1) 67/45

(2) 19/13

(3) 23/15

(4) 40/27 

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Answer is (2) 19/13

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Answer is (2) 19/13

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