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Q.

The standard electrode potential of the half cells is given below :
 

\large Z{n^{2 + }} + \,2{e^ - }\, \to \,Zn

      E = – 0.76V   

\large F{e^{2 + }} + 2{e^ - }\, \to \,Fe

 ;

 E = – 0.44V
 

The emf of the cell

 

\large F{e^{2 + }} + Zn\, \to \,Z{n^{2 + }} + \,Fe\,


IS

    

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a

 1.54V   

b

 – 1.54V

c

0.32V

d

+ 0.19V

answer is C.

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Detailed Solution

{E_{cell}} = E_c^o - E_a^o = - 0.44 + 0.76 = 0.32V

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The standard electrode potential of the half cells is given below :       E = – 0.76V    ; E = – 0.44V The emf of the cell IS