For a reaction \( \mathrm{A}(\mathrm{g}) \rightleftharpoons \mathrm{B}(\mathrm{g}) \), at equili...

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For a reaction \( \mathrm{A}(\mathrm{g}) \rightleftharpoons \mathrm{B}(\mathrm{g}) \), at equilibrium, the partial pressure of \( \mathrm{B} \) is found to be one fourth of the partial pressure of \( A \). The value of \( \Delta \mathrm{G}^{\circ} \) of the reaction \( \mathrm{A}(\mathrm{g}) \rightleftharpoons \mathrm{B}(\mathrm{g}) \) is:
(a) RT \( \ln 4 \)
(b) \( -\mathrm{RT} \ln 4 \)
(c) \( \mathrm{RT} \log 4 \)
(d) \( -\mathrm{RT} \log 4 \)
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