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It is because inability of ns2 electrons of the valence shell to participate in bonding that

(a) Sn2+ is reducing while Pb4+ is oxidising agent

(b) Sn2+ is oxidising while Pb4+ is reducing agent

(c) Sn2+ and Pb2+ are both oxidising and reducing agent

(d) Sn4+ is reducing while Pb4+ is oxidising agent

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