In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

Options

A. Lead sulphate (insoluble)
B. Lead acetate
C. Ammonium nitrate
D. Potassium sulphate

Explanation

To solve the question regarding the double displacement reaction between aqueous potassium iodide (KI) and lead nitrate (Pb(NO3)2), we need to determine an alternative compound that can be used in place of lead nitrate to still produce lead iodide (PbI2) as a yellow precipitate.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
The double displacement reaction between potassium iodide and lead nitrate can be represented as:
\[ 2KI + Pb(NO_3)_2 \rightarrow PbI_2 \downarrow + 2KNO_3 \]
Here, lead iodide (PbI2) is formed as a yellow precipitate.

2. **Identifying the Requirements**:
To produce lead iodide, we need a source of lead ions (Pb²⁺). Therefore, any alternative must be a lead salt.

3. **Evaluating the Options**:
The question provides several options for a substitute for lead nitrate. We need to identify which of these options are lead salts and are soluble in water:
- **Lead Acetate (Pb(CH3COO)2)**: This is a lead salt and is soluble in water.
- **Lead Sulfate (PbSO4)**: This is a lead salt but is insoluble in water.
- **Ammonium Nitrate (NH4NO3)**: This is not a lead salt.
- **Potassium Sulfate (K2SO4)**: This is not a lead salt.

4. **Selecting the Correct Substitute**:
Since we need a soluble lead salt to ensure that the reaction can proceed in aqueous solution, lead acetate is the only viable option. Lead sulfate cannot be used because it is insoluble, and the other two options do not contain lead.

5. **Conclusion**:
The correct alternative to lead nitrate in this reaction is lead acetate (option 2).

### Final Answer:
**Lead Acetate (Pb(CH3COO)2)** can be used in place of lead nitrate.

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