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Mixing potassium iodide and lead (II) nitrate solutions gives a yellow precipitate of lead (II) iodide. This is best classified as which kind of reaction?
AA reversible reaction goes only in the forward way
BAn irreversible reaction turns all products back to reactants
CA reversible reaction reaches equilibrium, irreversible does not
DAn irreversible reaction is always slower than a reversible one
Answer & Solution
Correct answer: C. A reversible reaction reaches equilibrium, irreversible does not
1. Two compounds in solution react by interchanging their ions, a double displacement reaction.
2. One product, lead (II) iodide, is insoluble and separates out as a precipitate.
3. A double displacement that forms an insoluble product is specifically a precipitation reaction; no free element is formed, so it is not single displacement.
4. Therefore it is a precipitation (double displacement) reaction.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Precipitation Reactions", p.149_
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