Which of the following metals are obtained by electrolysis of their chlorides in molten state? 

Options

A. I and iv
B. iii and iv
C. I and iii
D. I and ii

Explanation

To determine which metals are obtained by the electrolysis of their chlorides in the molten state, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Metals**: The metals given in the question are sodium, calcium, iron, and copper.

2. **Understand Electrolysis**: Electrolysis is a process that uses electrical energy to drive a chemical reaction. It is commonly used for extracting metals from their ores or compounds, especially for reactive metals.

3. **Classify the Metals**:
- **Sodium**: This is a highly reactive alkali metal.
- **Calcium**: This is also a highly reactive alkaline earth metal.
- **Iron**: This is a moderately reactive metal.
- **Copper**: This is a less reactive metal.

4. **Determine Reactivity**:
- Highly reactive metals (like sodium and calcium) are typically extracted through electrolysis of their molten salts (chlorides in this case).
- Less reactive metals (like iron and copper) do not require electrolysis of their chlorides in molten state for extraction.

5. **Conclusion**: Based on the reactivity of the metals, sodium and calcium can be obtained by the electrolysis of their chlorides in molten state. Therefore, the answer to the question is:
- **Sodium and Calcium**.

### Final Answer:
The metals obtained by electrolysis of their chlorides in molten state are **Sodium and Calcium**.

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