Electrolysis of KH produces `H_2`

Options

A. at the cathode
B. at the anode.
C. either at the cathode or at the anode.
D. Cannot be predicted.

Explanation

To solve the question regarding the electrolysis of potassium hydride (KH) and the production of hydrogen gas, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Electrolysis**: Electrolysis is a chemical process that uses an electric current to drive a non-spontaneous reaction. In this case, we are looking at the electrolysis of potassium hydride (KH).

2. **Identifying the Components**: Potassium hydride (KH) consists of potassium ions (K⁺) and hydride ions (H⁻). During electrolysis, these ions will migrate towards the electrodes.

3. **Identifying the Electrodes**: In electrolysis, there are two electrodes:
- **Anode**: The positive electrode where oxidation occurs.
- **Cathode**: The negative electrode where reduction occurs.

4. **Reactions at the Electrodes**:
- **At the Cathode**: Reduction occurs. The K⁺ ions gain electrons to form potassium metal (K).
\[ \text{K}^+ + e^- \rightarrow \text{K (s)} \]
- **At the Anode**: Oxidation occurs. The H⁻ ions lose electrons to form hydrogen gas (H₂).
\[ 2\text{H}^- \rightarrow \text{H}_2(g) + 2e^- \]

5. **Conclusion**: From the reactions above, we can conclude that hydrogen gas (H₂) is produced at the anode during the electrolysis of potassium hydride (KH).

### Final Answer:
Hydrogen gas (H₂) is produced at the anode during the electrolysis of potassium hydride (KH).

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