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secondary 4 | Chemistry
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How to find D as the answer?
CuO is basic oxide. insoluble cos it was not dissolved in water
CaO is also basic oxide. Soluble as it dissolve and react with water to form alkalis
(Copper II hydroxide is blue in colour while copper II carbonate is green in colour and copper metal can be pink in colour)
Aluminium oxide, on the other hand, is likely white or grey in colour.
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Hope this table will help you