`NaI+MnO_(2)+H_(2)SO_(4)(Conc.) to MnSO_(4)+I_(2)uarr`

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 reaction \( \text{NaI} + \text{MnO}_2 + \text{H}_2\text{SO}_4 \text{(Conc.)} \rightarrow \text{MnSO}_4 + \text{I}_2 \), we will analyze the oxidation states of the elements involved and determine the type of reaction.

### Step-by-Step Solution:

1. **Write the Reaction:**
The reaction can be written as:
\[ \text{NaI} + \text{MnO}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{MnSO}_4 + \text{I}_2 \]

2. **Determine Oxidation States:**
- For \( \text{NaI} \):
- \( \text{Na} = +1 \)
- \( \text{I} = -1 \)
- For \( \text{MnO}_2 \):
- \( \text{Mn} = +4 \) (since \( 2 \times -2 = -4 \))
- \( \text{O} = -2 \)
- For \( \text{H}_2\text{SO}_4 \):
- \( \text{H} = +1 \)
- \( \text{O} = -2 \)
- \( \text{S} = +6 \) (calculated from \( 2(+1) + X + 4(-2) = 0 \))
- For \( \text{MnSO}_4 \):
- \( \text{Mn} = +2 \) (as \( \text{SO}_4^{2-} \) has a charge of -2)
- For \( \text{I}_2 \):
- \( \text{I} = 0 \) (elemental state)

3. **Identify Changes in Oxidation States:**
- Iodine changes from \(-1\) in \( \text{NaI} \) to \( 0 \) in \( \text{I}_2 \) (oxidation).
- Manganese changes from \( +4 \) in \( \text{MnO}_2 \) to \( +2 \) in \( \text{MnSO}_4 \) (reduction).

4. **Determine the Type of Reaction:**
Since one species (iodine) is being oxidized (losing electrons) and another species (manganese) is being reduced (gaining electrons), 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 substances (NaI and MnO2).

5. **Conclusion:**
The correct classification of the reaction is a redox reaction, and it is not a disproportionation or contrapotination reaction. Therefore, the answer is:
- **Option 3: Redox Reaction**