Aluminium is usually found in +3 oxidati...

Aluminium is usually found in `+3` oxidation state. In contrast, thallium exists in `+1"and"+3` oxidation states. This is due to:

A

Inert pair effect

B

Lanthanoid contraction

C

Diagonal relationship

D

Lattice effect

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The correct Answer is:

A

Due to inert pair effect Tl is stable in +1 state.

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