`Na_(2)S+H_(2)SO_(4)("Conc.")to S darr+SO_(2)+Na_(2)SO_(4)`

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 question regarding the reaction between sodium sulfide (Na₂S) and concentrated sulfuric acid (H₂SO₄), we need to analyze the oxidation states of sulfur in the reactants and products to determine the type of reaction it represents.

### Step-by-Step Solution:

1. **Identify the Reactants and Products**:
- Reactants: Na₂S and H₂SO₄ (concentrated)
- Products: S (sulfur), SO₂ (sulfur dioxide), and Na₂SO₄ (sodium sulfate)

2. **Determine the Oxidation States**:
- In Na₂S, sulfur (S) has an oxidation state of -2.
- In H₂SO₄, sulfur (S) has an oxidation state of +6.
- In the products:
- The elemental sulfur (S) has an oxidation state of 0.
- In SO₂, sulfur (S) has an oxidation state of +4.
- In Na₂SO₄, sulfur (S) has an oxidation state of +6.

3. **Analyze the Changes in Oxidation States**:
- The sulfur in Na₂S changes from -2 to 0 (oxidation).
- The sulfur in H₂SO₄ changes from +6 to +4 (reduction).

4. **Identify the Type of Reaction**:
- Since there is a simultaneous oxidation (of sulfur from Na₂S) and reduction (of sulfur from H₂SO₄), this indicates that the reaction is a redox reaction.
- The reaction involves different sulfur species undergoing both oxidation and reduction, which classifies it as an intermolecular redox reaction.

5. **Conclusion**:
- The type of reaction is an intermolecular redox reaction.

### Final Answer:
The reaction between Na₂S and concentrated H₂SO₄ is an **intermolecular redox reaction**.