Q.

What is the EMF of the cell for the reaction Fe2++ZnZn2++Fe.  Given that E0Zn/Zn2+(1.0M)=0.76V;E0Fe/Fe2+(1.0M)=0.41V

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a

-1.17 V

b

0.35 V

c

1.17 V

d

-0.35 V

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 (- 0.41V ), hence Zn  acts as anode and Fe acts as cathode.
E0cell = E0Fe – E0Zn = -0.41V – (-0.76V) = +0.35V
Note: Standard potentials mentioned in th  question represent oxidation potential,  hence change sign to get reduction  potentials

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