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Question

For a spontaneous cell reaction, the sign of ΔG0 and E0cell will be respectively:

A
ve and ve
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B
+ve and +ve
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C
+ve and ve
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D
ve and +ve
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Solution

The correct option is D ve and +ve
Any redox reaction would occur spontaneously if the free energy change, (ΔG) is negative.

Relation between ΔG and Ecell is

ΔG=nFEcell
At standard condition,
ΔG0=nFE0cell

where,
n is the number of electrons involved in the reaction.
F is the Faraday constant
E0 is the standard cell emf

If ΔG0 is negative, then the E0 value will be positive.
Thus, for a feasible redox reaction, emf of the cell should be positive and ΔG0 should be negative.

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