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Q.

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ECu2+Cu0=+0.34VEZn2+Zn0=0.76V

Identify the incorrect statement from the options below for the above cell 

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a

 If Eext=1.1V, no flow of eor current occurs 

b

 If Eext<1.1v,Zn dissolves at anode and Cu deposits at cathode 

c

 If Eext>1.1V,Zn flows from Cu to Zn

d

 If Eext>1.1V,Zn dissolves at Zn electrode and Cu deposits at Cu electrode 

answer is D.

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Detailed Solution

Cathode has reduction, therefore it is negative whereas anode is positive because it corresponds to oxidation. 

Ecell =Ered/cathode-Ered/anode Ecell =-0.76 V-0.34 V Ecell <1.1 V

 Eext<1.1V  then zinc will act as cathode (Zn electrode) and Cu as anode (Cu electrode). 

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