`Mg(s)+2HCl to MgCl_(2)+H_(2)`

Options

A. For disproportionation reaction.
B. For comproportionation reaction.
C. For either intermolecular redox reaction or displacement reaction
D. For either thermal combination redox reaction or thermal decomposition redox reaction.

Answer

To solve the given question regarding the reaction \( \text{Mg}(s) + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2 \), we will analyze it step by step.

### Step 1: Identify the Type of Reaction
The reaction involves magnesium (Mg) reacting with hydrochloric acid (HCl) to produce magnesium chloride (MgCl₂) and hydrogen gas (H₂). This is a **displacement reaction** because magnesium displaces hydrogen from hydrochloric acid.

**Hint:** Look for a more reactive element replacing a less reactive one in the reaction.

### Step 2: Determine Oxidation States
Next, we need to assign oxidation states to each element in the reaction:
- In elemental form, magnesium (Mg) has an oxidation state of 0.
- In HCl, hydrogen (H) has an oxidation state of +1 and chlorine (Cl) has an oxidation state of -1.
- In MgCl₂, magnesium (Mg) has an oxidation state of +2 and chlorine (Cl) remains at -1.
- In hydrogen gas (H₂), hydrogen has an oxidation state of 0.

**Hint:** Remember that the oxidation state of an element in its elemental form is always 0.

### Step 3: Analyze Changes in Oxidation States
Now, we observe the changes in oxidation states:
- Magnesium goes from 0 (in Mg) to +2 (in MgCl₂), indicating it is **oxidized**.
- Hydrogen goes from +1 (in HCl) to 0 (in H₂), indicating it is **reduced**.

**Hint:** Oxidation involves an increase in oxidation state, while reduction involves a decrease.

### Step 4: Classify the Reaction as Redox
Since there is both oxidation (Mg) and reduction (H), this reaction is classified as a **redox reaction**. Specifically, it is an **intermolecular redox reaction** because it involves the transfer of electrons between two different species (Mg and H).

**Hint:** A redox reaction always involves both oxidation and reduction processes.

### Step 5: Eliminate Other Options
- **Disproportionation Reaction:** This is not a disproportionation reaction because no single species is being both oxidized and reduced.
- **Comproportionation Reaction:** This is not a comproportionation reaction because it does not involve a single species in two different oxidation states.
- **Combination or Decomposition Reaction:** This is neither a combination nor a decomposition reaction; it is specifically a displacement reaction.

**Hint:** Understand the definitions of different types of reactions to eliminate incorrect options.

### Conclusion
The correct classification of the reaction \( \text{Mg}(s) + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2 \) is that it is an **intermolecular redox reaction** and also a **displacement reaction**.

**Final Answer:** The reaction is classified as an intermolecular redox reaction (displacement reaction).