Question

1. Objective type questions

A. Fill in the blank spaces:

(iii) Potassium iodide solution reacts with lead acetate solution to form potassium acetate solution and ___________ precipitate of lead iodide. [ green/yellow]

Answer 1

• A chemical reaction may take place when two or more reactants come in contact with one another resulting in the formation of new substances called products accompanied by the transfer of energy among them.
• For example, when potassium iodide solution (colorless) reacts with lead acetate solution (colorless) to form potassium acetate solution and yellow precipitate of lead iodide.
• $\underset{\mathrm{Potassium}\mathrm{Iodide}}{2\mathrm{KI}\left(\mathrm{s}\right)}+\underset{\mathrm{Lead}\mathrm{Acetate}}{{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2\mathrm{Pb}\left(\mathrm{s}\right)}\to \underset{\mathrm{Potassium}\mathrm{acetate}}{2{\mathrm{CH}}_3\mathrm{COOK}\left(\mathrm{s}\right)}+\underset{\underset{\mathrm{Yellow}\mathrm{Precipitate}}{\mathrm{Lead}\mathrm{Iodide}}}{{\mathrm{PbI}}_2\left(\mathrm{s}\right)}$

Therefore, potassium iodide solution reacts with lead acetate solution to form potassium acetate solution and yellow precipitate of lead iodide.