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P-V plots for two gases during adiabatic...

P-V plots for two gases during adiabatic processes are shown in the figure. Plots 1 and 2 should corresponds respectively to

A

He and `O_2`

B

`O_2` and He

C

He and Ar

D

`O_2` and `N_2`

Text Solution

Verified by Experts

The correct Answer is:
B
For adiabatic process, `PV^(gamma)` = constant
For monatomic gas, `gamma = C_p /C_V = 1.67`
For diatomic gas, `gamma = 1.4 `
Since `gamma _(" diatomic") lt gamma_("monatomic")` So with increase in volume, decrease in pressure will be more for monatomic gas.
`rArr` Graph 1 is for diatomic and Graph 2 is for monatomic.
Correct option is (C).
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