Which one of the following elements of group 13 can react with alkali solutions to give `H_(2)` gas?

Options

A. Boron
B. Aluminium
C. Gallium
D. All of these

Answer

To solve the question of which element from group 13 can react with alkali solutions to produce hydrogen gas (H₂), we will analyze each of the given options: boron, aluminum, and gallium.

### Step-by-Step Solution:

1. **Identify the Elements of Group 13**:
- Group 13 elements include boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl). However, we will focus on the three elements provided in the options.

2. **Evaluate Boron**:
- When boron reacts with an alkali solution, such as sodium hydroxide (NaOH), it forms sodium borate (Na3BO3) and releases hydrogen gas (H₂).
- The reaction can be represented as:
\[ 2B + 6NaOH + 6H_2O \rightarrow 2Na_3BO_3 + 3H_2 \]
- Thus, boron can produce hydrogen gas when reacting with alkali.

3. **Evaluate Aluminum**:
- Aluminum also reacts with alkali solutions. The reaction with sodium hydroxide (NaOH) in the presence of water produces sodium aluminate (NaAl(OH)4) and releases hydrogen gas (H₂).
- The balanced reaction is:
\[ 2Al + 6NaOH + 6H_2O \rightarrow 2NaAl(OH)_4 + 3H_2 \]
- Therefore, aluminum can also produce hydrogen gas when reacting with alkali.

4. **Evaluate Gallium**:
- Gallium reacts similarly with alkali solutions. When gallium reacts with sodium hydroxide (NaOH) and water, it forms sodium gallate (Na3Ga(OH)6) and releases hydrogen gas (H₂).
- The balanced reaction is:
\[ 3Ga + 6NaOH + 6H_2O \rightarrow 3Na_3Ga(OH)_6 + 3H_2 \]
- Hence, gallium can also produce hydrogen gas when reacting with alkali.

5. **Conclusion**:
- Since all three elements (boron, aluminum, and gallium) can react with alkali solutions to produce hydrogen gas, the correct answer is:
- **Option 4: All of these**