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Strongest oxidant among the following is

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Al⁺³

Ga⁺³

Tl⁺³

B⁺³

answer is D.

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Detailed Solution

For Tl, +1 oxidation state is more stable than +3 oxidation state .

Therefore Tl⁺³ taking 2-electrons and converting to Tl⁺¹.Hence Tl⁺³ acts as strong oxidising agent(electron gainer).

\mathop {T{l^{ + 3}}}\limits_{Strong\,\,oxidi\operatorname{sing} \,\,agent} + 2{e^ - } \to T{l^{ + 1}}

Stability order of +3 oxidadtion state:

B^{+3 >} Al^{+3 >} Ga^{+3 >} In^{+3 >}Tl⁺³

+III oxidation state (higher oxidation state) stability decreases from top to bottom in a group.

Stability order of +1 oxidation state:

B^{+1 <} Al^{+1 <} Ga^{+1 <} In^{+1 <}Tl⁺¹

^→+I oxidation state (lower oxidation state) stability increases from top to bottom in a group.

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