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An aqueous solution containing 1M each o...

An aqueous solution containing 1M each of `Au^(+3), Cu^(+2), Ag^(+), Li^(+)` is being electrolysed using inert electrodes the value of standard potentials are
`E_(Ag^(+)//Ag)^(theta)a=0.80V,E_(cu^(2)+Cu)^(theta)=0.34V,E_(Au^(3+)//Au)^(theta)=1.50V,E_(Li^(+)//Li)^(theta)=-3.03V` With increasing voltage, find the sequence of deposition of metals on the cathode.

Text Solution

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Only `Au^(3+), Ag^(+)` and `Cu^(2+)` will deposit at cathode. Li+ will not deposit at cathode be cause SRP of water is -0.8274V So after `Cu^(2+ ), H_(2)` will evolve at cathode.
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