Question

Two colourless solutions X and Y were mixed together. On mixing, a yellow precipitate Z was formed. Which of the following statements is correct regarding X, Y and Z?

• A. X: Lead nitrate, Y: Potassium iodide,
  Z: Lead iodide
• B. X: Potassium chloride, Y: Water,
  Z: Chloride ions
• C. X: Sodium hydroxide, Y: Hydrochloric acid,
  Z: Sodium chloride
• D. X: Lead nitrate, Y: Sodium chloride,
  Z: Lead chloride

Answer 1

The correct option is A X: Lead nitrate, Y: Potassium iodide,

Z: Lead iodide
$\underset{\text{(X)}}{\underset{\text{(Colourless)}}{Pb\left(N{O}_3{)}_2\right(aq)}}+\underset{\text{(Y)}}{\underset{\text{(Colourless)}}{2KI\left(aq\right)}}\to \underset{\text{(Z)}}{\underset{\text{(yellow ppt.)}}{Pb{I}_2\left(s\right)}}+2KN{O}_3$

Hence correct option is (a).