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Question

Among the following, the element which show inert-pair effect are:

A
Bi
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B
Sn
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C
Pb
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D
C
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Solution

The correct options are
A Bi
B Sn
C Pb

The inertness of s subshell electrons towards the bond formation is called inert pair effect or it can be said as the inactiveness of electrons present in the outermost shell (i.e. ns2) to get unpaired and involve in bond formation is called inert pair effect.

for example:

1) In 13th group, thallium can exhibit +1 and +3 oxidation states but it is stable in +1 oxidation state only due to inert pair effect

2) In 14th group, lead shows both +2 and +4 oxidation states but it is stable in +2 oxidation state due to inert pair effect.

3)In group 15 elements, (Bi) the stability of +3 oxidation state increases down the group and that of +5 oxidation state decreases down the group, due to inert pair effect.


Hence, the correct options are A, B and C


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