Group-13 elements react with O2 in amorphous form to form oxides of type M2O3 (M = element). Which among the following is the most basic oxide?
Al2O3
Tl2O3
Ga2O3
B2O3
The Correct Option is B
Solution and Explanation
Group 13 Oxide Basicity
As we move down Group 13, the metallic character increases, and hence the electropositive character increases. As electropositivity increases, the basicity of the oxides increases.
The order of basicity for Group 13 oxides is \( \text{B}_2\text{O}_3 < \text{Al}_2\text{O}_3 < \text{Ga}_2\text{O}_3 < \text{In}_2\text{O}_3 < \text{Tl}_2\text{O}_3 \).
Conclusion:
\( \text{Tl}_2\text{O}_3 \) is the most basic oxide.
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