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2 moles of He gas (r=5/3) are initially ...

2 moles of He gas `(r=5/3)` are initially at a temperature of `27^(@)C` and occupy a volume of `20L`. The gas is first expanded at constant pressure until the volume is doubled, then undergoes reversible adiabatic change until the temperature returns to its initial value.
Which curve is correct for `P` vs `V`?

A

B

C

D

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The correct Answer is:
A
NA
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