Answers

2014-05-31T16:54:10+05:30
BECAUSE BOTH REDUCTION AND OXIDATION TAKES PLACE

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2014-05-31T21:15:58+05:30
Pb++  +  2e-  --------------------------> Pb            reduction                         (at cathode)
2Br-      -------------------------------> Br2  + 2e-       oxidation                 (at anode)
PbBr2  -------------------------------->  Pb  +  Br2
as oxidation and reduction both occour  hence this is called redox reaction 

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