The stable bivalency of Pb and trivalency of Bi isA. Due to d contract – InterviewSolution

InterviewSolution

1.	The stable bivalency of Pb and trivalency of Bi isA. Due to d contraction in Pb and BiB. Due to relativistic contraction of the 6s orbitals of Pb and Bi, leading to inert pair effectC. Due to screening effectD. Due to attainment of noble configuration
Answer» Correct Answer - B In the last element of the group, after the removal of electrons from p-orbitals, the remaining `ns^(2)` electrons behave like stable noble gas and do not take part in compound formation. This reluctance of the s- electron pair to take part in chemical combination is called inert pair effect. Thus, for the elements at the bottom of a group, lower oxidation state is more stable.

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