Which of the following metals does not show inert pair effect?

Thallium

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Gallium

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Indium

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Aluminium

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Solution

The correct option is D Aluminium
Answer:- (D) Aluminium
Inert pair effect means that the 2 s-electrons of the valence shell of heavier p-block elements form an inert pair and do not participate in bond formation.
Inert pair effect occurs due to the poor shielding effect of d and f orbitals.
Hence, due to small size and absence of d and f orbitals, Aluminium does not show inert pair effect.

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