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An aqueous solution containing 1 M each ...

An aqueous solution containing 1 M each of `Au^(3+),Cu^(2+),Ag^+,Li^+` is being electrolysed by using inert electrodes. The value of standard reduction potentials are:
`E_(Ag+//Ag)^(@)=0.8V,E_(Cu2+//Cu)^(@)=0.34V"and" E_(Au3+//Au)^(@)=1.50V,E_(Li+//Li)^(@)=-3.03V`
with increase voltage , the squence of deposition of metals on the cathode will be:

A

`Li,Cu,Ag,Au`

B

`Cu,Ag,Au`

C

`Au,Ag,Cu`

D

`Au,Ag,Cu,Li`

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The correct Answer is:
3
Only `Au^(+3),Ag^(+)` and `Cu^(2+)` will deposit at cathode.
Li will not deposit at cathode because SRP of water is `-0.8274V` so after `Cu^(2+),H_(2)` will evolve at cathode.
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