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a
bromine and iodine are more electronegative than chlorine.
b
iodine and bromine are smaller in size.
c
larger iodine and bromine are able to reduce Pb4+ to Pb2+ or Pb.
d
the statement is incorrect
answer is C.
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Detailed Solution
Pb4+ has higher polarizing power and Br- and I- being larger in size can easily give the electrons to Pb4+, i.e., as compared to Cl-, Br- and I- are good reducing agents.