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Q.

What is the EMF of the cell for the reaction Fe2++ZnZn2++Fe.Given that EZn/Zn+20=0.76V;  EFe/Fe+20=0.44V 

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a

1.17V 

b

0.32V

c

-1.17 V

d

-0.32V

answer is B.

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Detailed Solution

Among Zn and Fe electrodes, Zn is more electropositive as its SRP value(-0.76V) is less than that of Fe(-0.44V), hence Zn acts as anode and Fe acts as cathode. Ecell0=EFe0EZn0=0.44V0.76V=+0.32V 
Note: Standard potentials mentioned in the question represent oxidation potential, hence changes to get reduction potentials

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