A metal obtained by auto reduction or self reduction

Options

A. Na
B. Zn
C. Fe
D. Cu

Explanation

**Step-by-Step Solution:**

1. **Understanding Auto-reduction and Self-reduction:**
- Auto-reduction (or self-reduction) is a process where a metal is reduced from its own compound without the need for an external reducing agent. This means that the metal can reduce itself from its own oxide or sulfide.

2. **Example of Copper:**
- A common example of a metal that undergoes self-reduction is copper. Copper can be obtained from its compounds through a self-reduction process.

3. **Chemical Reaction:**
- Consider the copper compounds: Cu2O (copper(I) oxide) and Cu2S (copper(I) sulfide). The reaction can be represented as:
\[ 2 \, \text{Cu}_2\text{S} + \text{Cu}_2\text{O} \rightarrow 6 \, \text{Cu} + 2 \, \text{SO}_2 \]
- In this reaction, Cu2S reduces Cu2O to form elemental copper (Cu) and sulfur dioxide (SO2).

4. **Balancing the Chemical Equation:**
- To balance the equation, ensure that the number of atoms of each element is the same on both sides.
- In the balanced equation, you will have:
- 6 copper atoms on both sides.
- 2 sulfur atoms on both sides.
- 2 oxygen atoms on both sides.

5. **Oxidation and Reduction:**
- In this process, copper in Cu2O is reduced from a +1 oxidation state to 0 (elemental copper), while sulfur in Cu2S is oxidized from -2 in Cu2S to +4 in SO2.

6. **Conclusion:**
- Therefore, copper is an example of a metal that can be obtained through auto-reduction or self-reduction.

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