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During electrolysis of aqueous CuBr(2) u...

During electrolysis of aqueous `CuBr_(2)` using `Pt` electrode,

A

`Br_(2)(g)` is evolved at anode

B

`Cu(s)` is deposited at cathdoe

C

`Br_(2)(g)` is evolved at anode and `H_(2)(g)` at cathode

D

`H_(2)(g)` is evolved at anode

Text Solution

Verified by Experts

The correct Answer is:
a,b
Aqueous `CuBr_(2):`
At cathode `:(sqrt())Cu^(2+)+2e^(-)rarr Cu,`
`E^(c-)._(Cu^(2+)|Cu)=+0.34V`
`(X)2H_(2)O+2e^(-) rarr H_(2)+2overset(c-)(O)H,` ltbr. `E^(c-)._(H_(2)O|H_(2))=-0.83V`
At anode `:(sqrt())2Br^(c-)rarr Br_(2)+2e^(-),`
`E^(c-)._(Br^(c-)|Br_(2))=-1.09V`
`(X)2H_(2)Orarr O_(2)+4H^(o+)+2e^(-), `
`E^(c-)._(H_(2)O|H_(2))=-1.23V`
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