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JAMB Chemistry 1983 Question 1

Question 1

Acids, Bases and Salts

X is a crystalline salt of sodium. A solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives a white precipitate which is insoluble in dilute hydrochloric acid. X is

  1. A.Na2CO3
  2. B.NaHCO3
  3. C.NaHSO4
  4. D.Na2SO3
  5. E.Na2SO4.
Show the answer and explanation

Answer: C (NaHSO4)

Explanation

X is acidic (turns litmus red and liberates CO2 from carbonate) and is a sulphate (white precipitate with BaCl2 that does not dissolve in HCl). The acidic sulphate salt is NaHSO4.