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Question

(i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube? (ii) What type of reaction is this? (iii) Write a balanced chemical equation to represent the above reaction.

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Answer

(i) Observation: When a potassium iodide (KI) solution is added to a lead nitrate (Pb(NO₃)₂) solution, a bright yellow precipitate of lead iodide (PbI₂) is formed.

(ii) Type of Reaction: This is a Double Displacement Reaction (also called a Precipitation Reaction) because the ions exchange partners, forming an insoluble precipitate.

(iii) Balanced Chemical Equation:

Pb(NO3)2 + 2KI → PbI2↓ + 2KNO3

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