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

Options

A. `Li,Cu,Ag, Au`
B. `Cu,Ag,Au`
C. `Au,Ag,Cu`
D. `Au,Ag,Cu,Li`

Answer

C

Explanation

(C) Only `Au^(+3), Ag^(+) " and "Cu^(+2)` will deposit at cathode. Li will not deposit at cathode because SRP of `H_(2)` is 0.00V, so after `Cu^(+2),H_(2)` will evolve at cathode.