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1 mole of a monatomic and 2 mole of a di...

1 mole of a monatomic and 2 mole of a diatomic gas are mixed. The resulting gas is taken through a process in which molar heat capacity was found 3R. Polytropic constant in the process is

A

`-1//5`

B

`1//5`

C

`2//5`

D

`-2//5`

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