A reversible cyclic process for an ideal gas is shown below. Here, $P, V, a n d T$ are pressure, volume and temperature, respectively. The thermodynamic parameters $q, w, H a n d U$ are heat, work, enthalpy and internal energy, respectively.

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AC → Isochoric
AB → Isothermal
BC → Isobaric
$# q_{A C} = ∆ U_{B C} = n C_{V} (T_{2} - T_{1})$
$W_{A B} = n R T_{1} \ln (\frac{V_{2}}{V_{1}})$ A (wrong)
$# q_{B C} = ∆ H_{A C} = n C_{P} (T_{2} - T_{1})$
$W_{B C} = - P_{2} (V_{1} - V_{2})$ B (correct)
$# n C_{P} (T_{1} - T_{2}) < n C_{V} (T_{1} - T_{2})$ C (correct)
$∆ H_{C A} < ∆ U_{C A}$
$# D$ (wrong)

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