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JAMB Chemistry 1991 Question 33

Question 33

Metals and their Compounds

Which of the following salts can be melted without decomposition?

  1. A.Na2CO3
  2. B.CaCO3
  3. C.MgCO3
  4. D.ZnCO3.
Show the answer and explanation

Answer: A (Na2CO3)

Explanation

Sodium trioxocarbonate(IV) is thermally stable and melts without breaking down. The carbonates of calcium, magnesium and zinc decompose to the oxide and CO2 on heating.