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NEET levelSingle correct optionDifficulty 1 of 3pb113

The +1 oxidation state is most stable for which element of group 13?

A $B$
B $Al$
C $Ga$
D $Tl$

Answer: D

Thallium shows the inert pair effect: its

6 s^{2}

electrons are reluctant to take part in bonding, so

Tl X^{+}

is more stable than

Tl X^{3 +}

.

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