Group-13 elements react with O2 to form oxides of type M2O3. Which among the following is the most basic oxide?

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Canvas Classes · Accepted Answer

Strategy:
 Metallic character increases as you go down any group. The more metallic an element is, the more basic its oxide will be.

Step 1: Order elements by metallic character
Group 13: Boron (B)  Aluminum (Al)  Gallium (Ga)  Indium (In)  Thallium (Tl).
- Boron oxide () is acidic.
- Aluminum and Gallium oxides are amphoteric.
- Indium and Thallium oxides are basic.

Step 2: Conclusion
Thallium, being the most metallic at the bottom of the group, forms the most basic oxide ().

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