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The molar heat capacity at constant pres...

The molar heat capacity at constant pressure of nitrogen gas at `STP` is nearly `3.5 R`. Now when the temperature is increased, it gradually increases and approaches `4.5 R`. The most approprite reason for this behaviour is that at high temperatures

A

nitrogen does not behave as an ideal gas

B

nitrogen molecules dissociate in atoms

C

the molecules collides more frequently

D

molecules vibration gradually beome effective

Text Solution

Verified by Experts

The correct Answer is:
D
`C_(P) = 3.5 R (At STP)`
As temperature increases, vibrational degree of freedom becomes `2` at high temperature.
`C_(P) = (9)/(2) R = 4.5 R`
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