Question

Mention two reasons which are responsible for the so called ""inert pair effect"".

Answer 1

Answer:

Inert pair effect

Explanation:

Due to poor shielding od 3d orbitals, 4s electron experience high nuclear attraction that does not allow 4s electron to participate in bonding.

When we move from top to bottom in a group stability of lower oxidation state is haigh as compared to higher oxidation state therefore PbO2 is less stable than PbO