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JAMB Chemistry 2010 Question 18

Question 18

Acids, Bases and Salts

The acid that is used to remove rust is

  1. A.boric
  2. B.hydrochloric
  3. C.trioxonitrate (V)
  4. D.tetraoxosulphate (VI)
Show the answer and explanation

Answer: B (hydrochloric)

Explanation

Dilute hydrochloric acid dissolves iron(III) oxide (rust), so it is used to clean (pickle) rusty iron.