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JAMB Chemistry 1981 Question 49

Question 49

Acids, Bases and Salts

Which of the following represents a precipitation reaction?

  1. A.H2SO4 + NaCl → NaHSO4 + HCl.
  2. B.Fe + H2SO4 → FeSO4 + H2
  3. C.4HCl + MnO2 → MnCl2 + 2H2O + Cl2
  4. D.Na2SO4 + Pb(NO3)2 → PbSO4 + 2NaNO3
  5. E.CuO + 2HCl → CuCl2 + H2O.
Show the answer and explanation

Answer: D (Na2SO4 + Pb(NO3)2 → PbSO4 + 2NaNO3)

Explanation

Lead(II) sulphate is insoluble, so mixing the two soluble salts gives a solid precipitate of PbSO4.