Q. 57

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : ECell should have a positive value for the cell to function.

Reason : Ecathode<Eanode

A. Both assertion and reason are true and the reason is the correct explanation of assertion.

B. Both assertion and reason are true and the reason is not the correct explanation of assertion.

C. Assertion is true but the reason is false.

D. Both assertion and reason are false.

E. Assertion is false but reason is true.

Answer :

Ecellshouldhave a positive value for the cell to function. As,we know,


ΔrGcell = -nFEcell


Where, ΔrGcell= Gibbs free energy of the reaction.


For the proper functioning of the cell, the reaction must be spontaneous, i.e., ΔrGcellshould have a negative value and this is true only when Ecellhave a positive value.


We know, Ecell= Ecathode – Eanode


For reaction to be spontaneous, Ecellshould have a positive value. This is true only when Ecathode>Eanode.

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