First slide

Atomic and physical properties

Question

Strongest oxidant among the following is

Easy

A

B⁺³
B

Al⁺³
C

Ga⁺³
D

Tl⁺³

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 oxidadtion 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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