Question

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.

Options

• potassium chloride

• potassium nitride

• potassium sulphide

• potassium iodide

Answer 1

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of potassium iodide.

Explanation:

When lead nitrate solution is mixed with a solution of potassium iodide, a double displacement reaction takes place. The lead ions (Pb²⁺) combine with the iodide ions (I⁻) to form lead iodide (PbI₂), which is highly insoluble in water and settles down as a bright yellow precipitate. The other product, potassium nitrate, remains completely dissolved and clear in the solution.