Which element can...

A) Reduce Pb2+ to Pb but cannot reduce Ni2+ to Ni. Explain.

B) Oxidize I- to I2 but cannot oxidize Br- to Br2. Explain.

Need a fast response please!

A). Tin (Sn)

B). Silver (Ag) and Mercury (Hg)

Reason ----> reduction/oxidation potential series