Identify the correct statement(s) in relation to the following reaction.
`Zn+2HCl to ZnCl_(2)+H_(2)`

Options

A. Zinc is acting as an oxidant
B. Chlorine is acting as a reductant
C. Hydrogen ion is acting as an oxidant
D. Zinc is acting as a reductant

Explanation

To identify the correct statements regarding the reaction \( \text{Zn} + 2 \text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 \), we need to analyze the oxidation states of the elements involved and determine their roles in the redox reaction.

### Step-by-Step Solution:

1. **Write the Balanced Reaction:**
The reaction given is:
\[ \text{Zn} + 2 \text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 \]

2. **Determine Oxidation States:**
- **Zinc (Zn):** In its elemental form, the oxidation state is 0.
- **Hydrogen in HCl:** The oxidation state of hydrogen is +1, and for chlorine, it is -1.
- **Zinc in ZnCl2:** The oxidation state of zinc is +2 (since there are two -1 charges from the two chlorine atoms).
- **Hydrogen (H2):** In its elemental form, the oxidation state is 0.

3. **Identify Changes in Oxidation States:**
- **Zinc:** Changes from 0 (in Zn) to +2 (in ZnCl2). This indicates that zinc is losing electrons, hence it is being oxidized.
- **Hydrogen:** Changes from +1 (in HCl) to 0 (in H2). This indicates that hydrogen is gaining electrons, hence it is being reduced.
- **Chlorine:** Remains at -1 in both HCl and ZnCl2, so there is no change in oxidation state.

4. **Identify the Oxidizing and Reducing Agents:**
- **Oxidizing Agent:** The species that gets reduced. In this case, hydrogen ions (H+) from HCl are reduced to H2, so H+ acts as the oxidizing agent.
- **Reducing Agent:** The species that gets oxidized. Zinc is oxidized from 0 to +2, so zinc acts as the reducing agent.

5. **Evaluate the Statements:**
- **Statement 1:** "Zinc is acting as an oxidant." (False, because zinc is oxidized, not reduced.)
- **Statement 2:** "Chlorine is acting as a reductant." (False, because chlorine does not change its oxidation state.)
- **Statement 3:** "Hydrogen ion is acting as an oxidant." (True, because it gets reduced.)
- **Statement 4:** "Zinc is acting as a reductant." (True, because it gets oxidized and reduces another species.)

### Conclusion:
The correct statements regarding the reaction are:
- Statement 3: Hydrogen ion is acting as an oxidant.
- Statement 4: Zinc is acting as a reductant.

Thus, the correct answer is statements 3 and 4.

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