Match the List - I with List - II and identify the correct answer from the given codes :
| List - I (Thermodynamic Variables) (Symbols have their usual meanings.) | List - II (Expression) |
|---|---|
| (a) \(\Delta G\) | i. \(\Delta E + P\Delta V\) |
| (b) \(\Delta G^{\circ}\) | ii. \(- nFE^{\circ}\) |
| (c) \(\Delta S\) | iii. \(RT \ln \frac{V_1}{V_2}\) |
| (d) \(\Delta H\) | iv. \(nR \ln \frac{V_2}{V_1}\) |
Codes : (a) (b) (c) (d)
UGC NET - 2013,
Answer: B
The correct matching is a-iii, b-ii, c-iv, d-i, which is code B. The free energy change for an ideal gas at constant temperature is RT ln(V1/V2), so (a) goes with iii. The standard free energy change is related to the standard cell potential by the expression minus nFE°, so (b) goes with ii. The entropy change on isothermal expansion is nR ln(V2/V1), so (c) goes with iv. The enthalpy change is the energy change plus PΔV, so (d) goes with i.
Options A, C and D each pair at least one of these variables with the wrong expression.
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