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Q.

The standard electrode potential of the two half cells are given belowNi+2+2e-→Ni;E0=-0.25VoltZn+2+2e-→Zn;E0=-0.77voltThe voltage of cell formed by combining the two half cells would be

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a

– 1.02

b

+ 0.52 volt

c

+ 1.02 volt

d

– 0.52 volt

answer is B.

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Detailed Solution

Zn electrode is having lesser SRP and is anode.Ni electrode is having higher SRP and is cathodeEcell=Eco-Eao =-0.25-(-0.77)=+0.52
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