JEE MAIN - Chemistry (2020 - 4th September Morning Slot - No. 11)
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$$E_{C{u^{2 + }}|Cu}^0$$ = +0.34 V
$$E_{Z{n^{2 + }}|Zn}^0$$ = -0.76 V
Identify the incorrect statement from the option below for the above cell :
If Eext < 1.1 V, Zn dissolves at anode and Cu
deposits at cathode
If Eext = 1.1 V, no flow of e– or current
occurs
If Eext > 1.1 V, e– flows from Cu to Zn
If Eext > 1.1 V, Zn dissolves at Zn electrode
and Cu deposits at Cu electrode
Explanation
$$E_{cell}^0$$ = $$E_{C{u^{2 + }}|Cu}^0$$ - $$E_{Z{n^{2 + }}|Zn}^0$$
= 0.34 – (–0.76)
= 1.10 V
If Eext < 1.1 V then Zn dissolves at anode and copper deposits at Cathode.
If Eext > 1.1V then Zn deposited at zinc electrodes and Cu deposits at Cu electrode.
= 0.34 – (–0.76)
= 1.10 V
If Eext < 1.1 V then Zn dissolves at anode and copper deposits at Cathode.
If Eext > 1.1V then Zn deposited at zinc electrodes and Cu deposits at Cu electrode.
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