`BaSO_(4)darr+"dil. HCl (excess)" to `No reaction

Options

A. For precipitate formation reaction
B. For precipitate dissolution reaction
C. For precipitate exchange reaction
D. For no reaction

Answer

To solve the question regarding the reaction of BaSO₄ with dilute HCl, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactant in this case is barium sulfate (BaSO₄), which is a white solid precipitate.

2. **Understand the Nature of BaSO₄**: BaSO₄ is known to be insoluble in water. This means that it does not dissolve in aqueous solutions, which is crucial for understanding its behavior in reactions.

3. **Introduce Dilute HCl**: When dilute hydrochloric acid (HCl) is introduced to BaSO₄, we need to consider the potential reactions that can occur.

4. **Analyze Possible Reactions**: In general, we might expect that an acid could react with a sulfate salt. However, we need to consider the specific ions involved:
- BaSO₄ contains the sulfate ion (SO₄²⁻).
- HCl contains the chloride ion (Cl⁻).

5. **Consider the Reactivity of Ions**: The sulfate ion (SO₄²⁻) is not easily displaced by the chloride ion (Cl⁻) in this case. This is because sulfuric acid (H₂SO₄) has a higher acidity and stronger bonding with the sulfate ion than hydrochloric acid does with the chloride ion.

6. **Conclusion**: Since HCl cannot displace the sulfate ion from BaSO₄, no reaction occurs. Therefore, the reaction can be classified as "no reaction."

7. **Final Answer**: The correct option is "no reaction."