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Question

Chemistry Question on Electrochemical Cells

Cell reaction is spontaneous, when

A

EredE^{\circ}_{red} is negative

B

EredE^{\circ}_{red} is positive

C

ΔG\Delta G^{\circ} is negative

D

ΔG\Delta G^{\circ} is positive

Answer

ΔG\Delta G^{\circ} is negative

Explanation

Solution

ΔG=ΔHTΔS\Delta G=\Delta H-T \Delta S
For a spontaneous celll reaction, ΔH\Delta H should be negative and ΔS\Delta S should be positive. Hence, ΔG\Delta G should be negative.