Electrolysis of Molten Compounds

Electrolysis of Molten Compounds:

As shown in the diagram of experiment 7.5

Lead bromide is melted & on passing electricity, lead as a metal will be collected on cathode while bromine being a non-metal will be collected on anode.

       PbBr₂          à        Pb         +        Br₂

At the cathode:

Lead, Pb²⁺, gains 2 electrons forming lead atoms

    Pb²⁺        +       2e^-        à         Pb

At the anode:

2 bromide, Br^-, each loses 1 electron forming bromine molecule Br₂

2Br^-        -     2e^-          à          Br₂

                   Class Assessment

1.  Lead as a metal will be collected on cathode. T

2.  Bromine being a non-metal will be collected on anode. T

3.  Lead, Pb²⁺, gains -------- electrons forming lead atoms.

a) 2

b) 4

c) 6