During electrolysis of fused calcium hydride, the hydrogen is produced at

Options

A. Cathode
B. Anode
C. Hydrogen is not liberated at all
D. `H_(2)` produced reacts with oxygen to form water.

Explanation

To solve the question regarding the electrolysis of fused calcium hydride (CaH2), we need to analyze the process step by step.

### Step-by-Step Solution:

1. **Understanding the Compound**:
- Calcium hydride has the formula CaH2. In this compound, calcium (Ca) has a +2 oxidation state (Ca²⁺), and hydride ions (H⁻) are present as anions.

2. **Fused Calcium Hydride**:
- The term "fused" means that calcium hydride is in a molten state. This indicates that it is not dissolved in water but is rather in a liquid form due to high temperature.

3. **Electrolysis Process**:
- During electrolysis, two processes occur: reduction at the cathode and oxidation at the anode.

4. **Reduction at the Cathode**:
- At the cathode, the calcium ions (Ca²⁺) will undergo reduction. This means that they will gain electrons to form solid calcium (Ca).
- The reaction can be represented as:
\[ \text{Ca}^{2+} + 2e^- \rightarrow \text{Ca (s)} \]

5. **Oxidation at the Anode**:
- At the anode, the hydride ions (H⁻) will undergo oxidation. This means that they will lose electrons and form hydrogen gas (H₂).
- The reaction can be represented as:
\[ 2\text{H}^- \rightarrow \text{H}_2(g) + 2e^- \]

6. **Conclusion**:
- From the above reactions, we can conclude that hydrogen gas is produced at the anode during the electrolysis of fused calcium hydride.

### Final Answer:
- Hydrogen is produced at the **anode** during the electrolysis of fused calcium hydride.