Which of the following ppt (s) of sulphite ion have white colour ?

Options

A. `Ag_(2)SO_(3)`
B. `SrSO_(3)`
C. `CaSO_(4)`
D. `BaSO_(3)`

Answer

To determine which of the following precipitates of the sulphite ion (SO3^2-) have a white color, we will analyze each option provided:

### Step-by-Step Solution:

1. **Identify the Compounds:**
We are given four compounds to analyze:
- Ag2SO3 (Silver Sulphite)
- SrSO3 (Strontium Sulphite)
- CaSO3 (Calcium Sulphite)
- BaSO3 (Barium Sulphite)

2. **Analyze Ag2SO3 (Silver Sulphite):**
- Silver sulphite is known to be a white substance.
- However, it can change color under light exposure, transitioning from white to purple and then to black.
- **Conclusion:** Ag2SO3 forms a white precipitate.

3. **Analyze SrSO3 (Strontium Sulphite):**
- Strontium sulphite is described as a white crystalline powder.
- It occurs naturally as the mineral celestine.
- **Conclusion:** SrSO3 forms a white precipitate.

4. **Analyze CaSO3 (Calcium Sulphite):**
- Calcium sulphite is also recognized as a white solid.
- It is notably produced during flue gas desulphurization.
- **Conclusion:** CaSO3 forms a white precipitate.

5. **Analyze BaSO3 (Barium Sulphite):**
- Barium sulphite is a white powder.
- It is used in the manufacturing of paper.
- **Conclusion:** BaSO3 forms a white precipitate.

6. **Final Conclusion:**
- All four compounds (Ag2SO3, SrSO3, CaSO3, BaSO3) form white precipitates when reacting with sulphite ions.
- Therefore, the answer is that all of the given options have white precipitates.

### Summary:
All options (1, 2, 3, and 4) are correct as they all yield white precipitates of sulphite ions.

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