NEET 2017 Physics and Chemistry

Inability of ns2 electrons of the valence shell to participate in bonding on moving down the group in heavier p-block elements is called inert pair effect As a result, Pb(II) is more stable
than Pb(IV) Sn(IV) is more stable than Sn(II)
∴Pb(IV) is easily reduced to Pb(II)
∴Pb(IV) is oxidising agent Sn(II) is easily oxidised to Sn(IV)
∴Sn(II) is reducing agent