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Q.

Which of the following statements is/are incorrect?

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a

Electrical work done in one second is equal to electrical potential multiplied by total charge passed

b

Charge has to be passed reversibly in order to obtain the maximum work from Galvanic cell

c

The reversible work done by Galvanic cell is equal to decrease in its Gibbs energy

d

ΔG=−nEcell

answer is A.

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Detailed Solution

The standard free energy (∆Go) is related to standard electrode potential (Eo ) and equilibrium constant as            ΔG∘=−nFE∘    and    ΔG∘=−RTloge⁡Keq     Thus,if Ecell ∘ is − ve,then ΔG∘ is + ve,i.e., ΔG∘>0. Hence, Keq would be negative and less than 1, Keq<1.
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