12. State the change in colour seen when the following are heated:
(a) Copper carbonate
(b) Zinc carbonate
(c) Mercury (II) oxide
(d) Hydrous copper (II) sulphate
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a) Copper carbonate - green
(b) Zinc carbonate - yellow
(c) Mercury (II) oxide - Silver
(d) Hydrous copper (II) sulphate - Blue
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