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JAMB Chemistry 2006 Question 13

Question 13

Qualitative Analysis

The sulphide which is insoluble in dilute hydrochloric acid is

  1. A.FeS
  2. B.CuS
  3. C.ZnS
  4. D.Na2S
Show the answer and explanation

Answer: B (CuS)

Explanation

CuS is extremely insoluble, so it does not dissolve in dilute HCl. FeS and ZnS dissolve in dilute acid giving H2S, and Na2S is soluble even in water.