Q.

The colour of lead iodide is

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a

Crimson

b

Blue

c

Yellow

d

Red

answer is C.

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Detailed Solution

The color of lead iodide (PbI₂) is bright yellow. It is a crystalline solid that is commonly formed as a precipitate in chemical reactions.

Explanation

  • Lead iodide is typically produced when a solution of lead nitrate (Pb(NO₃)₂) reacts with potassium iodide (KI) in a double displacement reaction: Pb(NO3)2(aq)+2KI(aq)→PbI2(s)+2KNO3(aq)Pb(NO₃)₂ (aq) + 2KI (aq) \rightarrow PbI₂ (s) + 2KNO₃ (aq)Pb(NO3)2(aq)+2KI(aq)→PbI2(s)+2KNO3(aq)
  • The insoluble PbI₂ forms as a bright yellow precipitate, while potassium nitrate remains in the solution.

Properties of Lead Iodide

PropertyDetails
ColorBright yellow
StateCrystalline solid
SolubilitySlightly soluble in water
Use in DemonstrationsKnown for its "golden rain" experiment, where recrystallization in hot water forms shiny golden flakes.
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