Group-13 elements react with $\mathrm{O}_{2}$ in amorphous form to form oxides of type $\mathrm{M}_{2}\mathrm{O}_{3}$ ($\mathrm{M}=$ element). Which among the following is the most basic oxide?

(C) $\mathrm{Tl}_{2}\mathrm{O}_{3}$

(A) $\mathrm{Al}_{2}\mathrm{O}_{3}$

(B) $\mathrm{Ga}_{2}\mathrm{O}_{3}$

(D) $\mathrm{B}_{2}\mathrm{O}_{3}$

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · p-Block Elements

Group-13 elements react with

O_{2}

in amorphous form to form oxides of type

M_{2} O_{3}

(

M =

element). Which among the following is the most basic oxide?

(A) $Al_{2} O_{3}$
(B) $Ga_{2} O_{3}$
(C) $Tl_{2} O_{3}$ ✓ Correct
(D) $B_{2} O_{3}$

Answer: (C)

Solution

Down the group in Group-13, the electropositive character of elements increases, making their oxides more basic. The order of basicity is:

B_{2} O_{3}

(acidic) <

Al_{2} O_{3}

Ga_{2} O_{3}

(amphoteric) <

In_{2} O_{3}

Tl_{2} O_{3}

(basic). Therefore,

Tl_{2} O_{3}

is the most basic oxide.

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option

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