Question

For the feasibility of a redox reaction in a cell, the emf should be

Answer 1

Correct option is A. Positive

Answer A

Solution :

Any redox reaction would occur spontaneously if the free energy charnge $$(ΔG)$$ is negative.

$$ΔG^∘=nFE^2$$

Where n is the number of electrons involved, F is the value of faraday and $$E^∘$$ is the cell emf. $$ΔG^2$$ can be negative if $$2$$ is $$\textbf{positive.}$$