`underset(("Coloured solution"))(P)+BaCl_(2) to underset(("White"))(Qdarr)+underset(("Coloured solution"))(R)` ltBrgt Then salt 'P' in above reaction is:

Options

A. `Na_(2)CrO_(4)`
B. `ZnSO_(4)`
C. `CuSO_(4)`
D. `AgNO_(3)`

Explanation

To determine the salt 'P' in the given reaction, we need to analyze the possible compounds that could react with barium chloride (BaCl₂) to produce a white precipitate (Q) and a colored solution (R).

### Step-by-Step Solution:

1. **Identify the Reaction**:
The reaction involves a compound P reacting with barium chloride (BaCl₂) to produce a white precipitate (Q) and a colored solution (R). The general form of the reaction can be represented as:
\[ P + BaCl_2 \rightarrow Q + R \]

2. **List Possible Compounds for P**:
The options provided for compound P are:
- Sodium chromate (Na₂CrO₄)
- Zinc sulfate (ZnSO₄)
- Copper sulfate (CuSO₄)
- Silver nitrate (AgNO₃)

3. **Evaluate Each Compound**:
- **Sodium Chromate (Na₂CrO₄)**:
When Na₂CrO₄ reacts with BaCl₂, it forms barium chromate (BaCrO₄), which is a yellow precipitate, not white. Therefore, this option does not satisfy the conditions.

- **Zinc Sulfate (ZnSO₄)**:
The reaction of ZnSO₄ with BaCl₂ produces barium sulfate (BaSO₄), which is a white precipitate, but the solution is not colored. Hence, this option is also not valid.

- **Copper Sulfate (CuSO₄)**:
When CuSO₄ reacts with BaCl₂, it forms barium sulfate (BaSO₄), which is a white precipitate, and copper(II) chloride (CuCl₂), which is a blue solution. This option satisfies both conditions of producing a white precipitate and a colored solution.

- **Silver Nitrate (AgNO₃)**:
The reaction of AgNO₃ with BaCl₂ produces silver chloride (AgCl), which is a white precipitate, and barium nitrate (Ba(NO₃)₂). However, the solution does not exhibit any color, making this option invalid.

4. **Conclusion**:
The only compound P that satisfies the reaction conditions of producing a white precipitate (Q) and a colored solution (R) is **Copper Sulfate (CuSO₄)**.

Thus, the answer is:
**Copper Sulfate (CuSO₄)**.