ECu2+∣Cu0=+0.34VEZn2+∣Zn0=−0.76VIdentify the incorrect statement from the options below for the above cell
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a
If Eext=1.1V, no flow of e−or 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
Since Anode and cathode are in standard conditions Ecell =Ecell ∘=1.1V1) Since Eext is opposiving the emf of galvanic cell if Eext=1.1V then no net current will flow (correct)2) If Eext<1.1V then zinc will act as cathode and Cu as anode. Zn will dissolve and Cu will deposit (correct)3) If Eext>1.1V then oxidation takes place at Cu and reduction takes place at Zn. Electron will move from copper to zinc. (correct)4) Since (2) is correct (4) is wrong