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2017 O Level Chem P1 Q21 — Salts / Solubility Rules Solution

Salts / Solubility Rules 2017 O Level Pure Chemistry · Paper 1 · Q21

Question

Which solutions, when mixed together, form an insoluble salt?

Adilute hydrochloric acid and lead(II) nitrate
Bdilute hydrochloric acid and magnesium nitrate
Cdilute sulfuric acid and sodium hydroxide
Ddilute sulfuric acid and zinc chloride

Correct answer: A

Video Solution

Explanation

Answer: A. Lead(II) chloride is insoluble, so mixing dilute hydrochloric acid with lead(II) nitrate forms a white precipitate of \(\text{PbCl}_2\).

The other combinations give only soluble products (magnesium chloride, sodium sulfate and zinc sulfate are all soluble).

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