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 :
Write Nernst equation and find e.m.f of cell Ni//Ni_((0.01M))^(2+)//Cu_((1M))^(2+)//Cu_() . Given E_(Cu^(2+)//Cu)^(@)= 0.34V, E_(Ni^(2+)//Ni)^(@)= -0.22V
The emf of the cell: Ni//Ni^(2+) (1.0 M)//Au^(3+) (1.0M)//Au (E^(@) = -0.25V " for " Ni^(2+)//Ni and E^(@)= 1.5V "for " Au^(3+)//Au) is