The value of Cp−Cv=1.00R for a gas in state A and Cp−Cv=1.06R in another state. If PA and PB denote the pressure and TA and TB denote the temperatures in the two states, then
A
PA=PB, TA>TB
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B
PA>PB, TA=TB
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C
PA<PB, TA>TB
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D
PA=PB, TA<TB
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Solution
The correct option is CPA<PB, TA>TB Since we know that, Cp−CV=nR Therefore, state A contain less number of moles of gas then state B Hence, Pressure in state A will be less than Pressure in state B whereas Temperature in state A will be greater than temperature in state B Since, P∝n T∝1/n Hence, PA<PB TA>TB option (C)