The white precipitate formed in chloride estimation is2 pointsBaSO4AgClCaCO3none

To determine the correct answer to the question regarding the white precipitate formed in chloride estimation, let’s analyze the options given.

1. BaSO₄ (Barium Sulfate): This compound forms a white precipitate when barium ions react with sulfate ions, but it is not specifically related to chloride estimation.

2. AgCl (Silver Chloride): Silver chloride is a well-known white precipitate that forms when silver nitrate reacts with chloride ions in a solution. This is a key reaction used in the estimation of chloride.

3. CaCO₃ (Calcium Carbonate): Calcium carbonate usually appears as a white precipitate when calcium ions react with carbonate ions, not specifically related to chloride estimation.

4. None: This option implies that none of the above compounds is the correct answer.

Conclusion

Based on the analysis, the white precipitate specifically formed in chloride estimation is AgCl (Silver Chloride). This compound is significant in analytical chemistry when testing for chloride ions in a solution.