Question

Current is applied to a motlen mixture of PbF2, NiCl2, MgI2. What is produced at cathode? F2 Ni Pb I2 Cl2 Mg What is produced at the anode? Ni F2 Cl2 I2 Pb Mg

Answer 1

In molten PbF2 = Pb2+ + 2F-

At cathode: Pb2+ + 2e- -----> Pb(s) => Reduction

At anode: 2F- -----> F2(g) + 2e- => Oxidation

In molten NiCl2 = Ni2+ + 2Cl-

At cathode: Ni2+ + 2e- -----> Ni(s)

At anode: 2Cl- -----> Cl2(g) + 2e-

In molten MgI2 = Mg2+ + 2I-

At cathode: Mg2+ + 2e- -----> Mg(s)

At anode: 2IF- -----> I2(g) + 2e-

At cathode, Pb, Ni, Mg metals deposits due to reduction reaction

At anode, F2, Cl2, I2 gases evolves due to oxidation reaction