9. An ideal gas is compressed isothermally until its pressure becomes four times the initial and

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9. An ideal gas is compressed isothermally until its pressure becomes four times the initial and then allowed to expand adiabatically to regain its original volume. The ratio of final pressure to initial pressure is [Y = 1.5] [2021]
(A) 3:2
(C) 2:1
(B) 2:3
(D) 1:2

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