During another seven minutes of electrolysis of aqueous copper sulphate solution after complete reduction of Cu ion, the substances evolved at cathode and anode are respectively:

Q. During electrolysis of an aqueous solution of

C u S O_{4}

using copper electrodes, if 2.5 g of Cu is deposited at cathode, then at anode:

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During electrolysis of aqueous CuBr2 using Pt electrode:

The correct options are A Br2(g) is evolved at anode. B Cu(s) is deposited at cathodeAqueous CuBr2 : At cathode: Cu2++2e−→Cu; At anode : 2Br⊖→Br2+2e−Br2(g) is evolved at anode and Cu(s) is deposited at cathode.

During electrolysis of aqueous $C u B r_{2}$ using Pt electrode:

The correct options are
A $B r_{2} (g)$ is evolved at anode.
B Cu(s) is deposited at cathode
Aqueous $C u B r_{2}$ :
At cathode:
$C u^{2 +} + 2 e^{-} \to C u$ ;

At anode :
$2 B r^{⊖} \to B r_{2} + 2 e^{-}$

$B r_{2} (g)$ is evolved at anode and Cu(s) is deposited at cathode.