Question

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?

• A. Al₂O₃
• B. Tl₂O₃
• C. Ga₂O₃
• D. B₂O₃

Answer 1

The Correct Option is B

To determine which oxide among the given options is the most basic, we need to understand the trends in basicity of oxides within Group 13 elements of the periodic table.

The Group 13 elements include Boron (B), Aluminum (Al), Gallium (Ga), and Thallium (Tl). The oxide of interest for each element is represented by the formula M₂O₃ where M is the element.

1. B₂O₃: Boric oxide is acidic in nature. It reacts with water to form boric acid, making it one of the least basic among the options.
2. Al₂O₃: Aluminum oxide is amphoteric, meaning it can exhibit both acidic and basic characteristics. It reacts with both acids and bases.
3. Ga₂O₃: Gallium oxide is also amphoteric, similar to Al₂O₃, and is not predominantly basic.
4. Tl₂O₃: Thallium oxide is the most basic among these oxides as it tends to react with acids to form salts and water, showing more pronounced basic behavior.

Basicity generally increases down the group as metallic character increases. Hence, Tl₂O₃ is the most basic oxide among the given options.

Therefore, the correct answer is Tl₂O₃.