If Cp and Cv are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation Cp-Cv=R is exact for

Ideal and real gases at all pressures

Ideal gas at all pressures and real gas at a moderate pressure

Ideal gas and nearly true for real gases at high pressure

Ideal gas and nearly true for real gases at a moderate pressure

If Cp and Cv are the specific heats for a gas at constant pressure and

1.	If Cp and Cv are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation Cp-Cv=R is exact for
A.	Ideal and real gases at all pressures
B.	Ideal gas at all pressures and real gas at a moderate pressure
C.	Ideal gas and nearly true for real gases at high pressure
D.	Ideal gas and nearly true for real gases at a moderate pressure
Answer» E.

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If Cp and Cv are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation Cp-Cv=R is exact for

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