`MCrO_(4)darr(M^(2+)=Ba^(2+)Pb^(2+))+AcOHto`No dissolution

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 \( MCrO_4 \) with \( AcOH \) resulting in "No dissolution," we can follow these steps:

### Step 1: Understand the Reactants
We have \( MCrO_4 \), where \( M \) can be \( Ba^{2+} \) or \( Pb^{2+} \). This compound is a metal chromate, which is typically a precipitate in aqueous solutions.

### Step 2: Identify the Solvent
The other reactant is \( AcOH \) (acetic acid), which is a weak acid and can act as a solvent in this reaction.

### Step 3: Analyze the Reaction
The reaction indicates that there is no dissolution occurring. This means that when \( MCrO_4 \) is mixed with \( AcOH \), the precipitate does not dissolve in the acetic acid.

### Step 4: Determine the Type of Reaction
Given that there is no dissolution, we need to consider the types of reactions:
- **Precipitate Formation Reaction:** A new precipitate forms.
- **Precipitate Dissolution Reaction:** A precipitate dissolves.
- **Precipitate Exchange Reaction:** Precipitates are exchanged but remain present.
- **No Reaction:** No change occurs.

Since we have established that there is no dissolution and the precipitate remains intact, we conclude that there is no reaction taking place.

### Step 5: Conclusion
The most appropriate answer to the question is that there is "No Reaction" occurring when \( MCrO_4 \) is treated with \( AcOH \).

### Final Answer
**Option D: No Reaction**

---