Which of the following reagents can be used to distinguish between `SO_(2)` and `CO_(2)`?

Options

A. Lime water
B. Zine nitropruside paste in water
C. Potasium iodate and strach
D. Acidfied potessium dichromate of aqueous

Explanation

To distinguish between sulfur dioxide (SO₂) and carbon dioxide (CO₂), we can use specific reagents that will react differently with each gas. Here’s a step-by-step solution to the problem:

### Step 1: Understanding the Gases
- **Sulfur Dioxide (SO₂)**: A colorless gas with a pungent smell, known to act as a reducing agent.
- **Carbon Dioxide (CO₂)**: A colorless gas that is produced by respiration and combustion, and is not a reducing agent.

### Step 2: Evaluating Lime Water
- **Lime Water (Calcium Hydroxide, Ca(OH)₂)**: Both SO₂ and CO₂ react with lime water to form precipitates.
- **CO₂** reacts to form calcium carbonate (CaCO₃), which is a white precipitate that turns lime water milky.
- **SO₂** reacts to form calcium sulfite (CaSO₃), which also turns lime water milky.

**Conclusion**: Lime water cannot distinguish between SO₂ and CO₂ since both gases cause the same reaction.

### Step 3: Evaluating Zinc Nitroprusside
- **Zinc Nitroprusside (Zn[Fe(CN)₅(NO)])**: This reagent is salmon-colored and reacts specifically with SO₂.
- When SO₂ is present, it forms a red-colored compound, indicating the presence of SO₂.

**Conclusion**: Zinc nitroprusside can be used to distinguish SO₂ from CO₂.

### Step 4: Evaluating Potassium Iodate
- **Potassium Iodate (KIO₃)**: This reagent can also be used to distinguish between the two gases.
- SO₂ reduces iodate ions (IO₃⁻) to iodine (I₂), which can be detected by its reaction with starch, producing a blue color.

**Conclusion**: Potassium iodate can be used to distinguish SO₂ from CO₂.

### Step 5: Evaluating Acidified Potassium Chromate
- **Acidified Potassium Chromate (K₂Cr₂O₇)**: This reagent is reduced by SO₂.
- In the presence of SO₂, the orange dichromate ion (Cr₂O₇²⁻) is reduced to green Cr³⁺ ions.

**Conclusion**: Acidified potassium chromate can also be used to distinguish SO₂ from CO₂.

### Final Answer
The reagents that can be used to distinguish between SO₂ and CO₂ are:
- Zinc Nitroprusside
- Potassium Iodate
- Acidified Potassium Chromate