The relation between Cp and Cv for an ideal gas (per mole) is:
ACp − Cv = R
BCp + Cv = R
CCp / Cv = R
DCp · Cv = R
Answer & Solution
Correct answer: A. Cp − Cv = R
1. Cv comes from ΔU at constant V; Cp comes from ΔU + PΔV at constant P.
2. The extra PΔV term at constant P equals nRΔT per mole.
3. So Cp = Cv + R (Mayer's relation).
4. Hence Cp − Cv = R.
_Source: NCERT Class 11 Physics Ch 11, §11.6 Specific Heat Capacity_
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