When `Al` is added to `KOH` solution

Options

A. No action takes place
B. Oxygen is evolved
C. Water is produced
D. hydrogen is evolved

Answer

**Step-by-Step Solution:**

1. **Understanding the Reaction**: When aluminum (Al) is added to a potassium hydroxide (KOH) solution, a chemical reaction occurs. Aluminum is a reactive metal and can react with strong bases like KOH.

2. **Writing the Chemical Equation**: The reaction between aluminum and potassium hydroxide can be represented by the following chemical equation:
\[ 2Al + 2KOH + 6H_2O \rightarrow 2K[Al(OH)_4] + 3H_2 \]
In this reaction, aluminum reacts with potassium hydroxide and water to produce potassium tetrahydroxoaluminate (K[Al(OH)4]) and hydrogen gas (H2).

3. **Identifying the Products**: From the reaction, we can see that one of the products formed is hydrogen gas (H2). This indicates that when aluminum is added to KOH solution, hydrogen is evolved.

4. **Evaluating the Options**: Now, let’s evaluate the options given in the question:
- **Option 1**: No action takes place - This is incorrect because a reaction does occur.
- **Option 2**: Oxygen is evolved - This is incorrect; oxygen is not a product of this reaction.
- **Option 3**: Water is produced - This is incorrect; water is not produced in this reaction.
- **Option 4**: Hydrogen is evolved - This is correct as hydrogen gas is indeed produced.

5. **Conclusion**: Therefore, the correct answer is that hydrogen gas is evolved when aluminum is added to KOH solution.