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JAMB Chemistry 1990 Question 39

Question 39

Metals and their Compounds

To make coloured glasses, small quantities of oxides of metals which form coloured silicates are often added to the reaction mixture consisting of Na2CO3 and SiO2. Such a metal is

  1. A.potassium
  2. B.barium
  3. C.zinc
  4. D.copper
Show the answer and explanation

Answer: D (copper)

Explanation

Transition metals such as copper form coloured compounds; copper oxide gives glass a blue-green colour. Potassium, barium and zinc compounds are colourless.