Which of the following oxides are basic ?

Options

A. `B_(2)O_(3)`
B. `Tl_(2)O`
C. `In_(2)O_(3)`
D. `Al_(2)O_(3)`

Explanation

To determine which of the given oxides are basic, we need to analyze each oxide's behavior when reacted with water. Let's go through the oxides one by one:

1. **B2O3 (Boron Trioxide)**:
- When B2O3 is added to water, it reacts to form boric acid (H3BO3).
- Since it forms an acid, B2O3 is **acidic** in nature.

2. **Tl2O (Thallium(I) Oxide)**:
- When Tl2O is added to water, it reacts to form thallium hydroxide (TlOH).
- TlOH is a base, so Tl2O is **basic** in nature.

3. **In2O3 (Indium(III) Oxide)**:
- When In2O3 is added to water, it reacts to form indium hydroxide (In(OH)3).
- In(OH)3 is a base, so In2O3 is **basic** in nature.

4. **Al2O3 (Aluminum Oxide)**:
- When Al2O3 is added to water, it can react to form aluminum hydroxide (Al(OH)3).
- Al(OH)3 can act as both an acid and a base, which makes Al2O3 **amphoteric** in nature.

### Summary of Findings:
- B2O3: Acidic
- Tl2O: Basic
- In2O3: Basic
- Al2O3: Amphoteric

### Conclusion:
The oxides that are basic are **Tl2O** and **In2O3**.