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Which of the following equations represents a double displacement reaction in which an insoluble precipitate is formed?

Answer and explanation

Correct answer: \(\mathrm{Pb(NO_3)_2 + 2KI \rightarrow PbI_2\downarrow + 2KNO_3}\)

In option A, the ions of two ionic compounds exchange partners. \(\mathrm{Pb^{2+}}\) ions combine with \(\mathrm{I^-}\) ions to form yellow, insoluble \(\mathrm{PbI_2}\) as a precipitate, while \(\mathrm{KNO_3}\) remains in solution. In contrast, option B is a single displacement reaction because zinc displaces hydrogen.

Related tags

Chemical ReactionsDouble DisplacementPrecipitation ReactionChemical EquationsClass 10 Science

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