Question

Raju is trying to dissolve Copper oxide in water but it is not dissolved. Now he
mixes Copper oxide with an acid and neutralized it. What can you conclude about
the Copper oxide?

Answer 1

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Copper oxide is an amphoteric substance, which means it can act as an acid or a base. It is non-flammable and insoluble in water. 


Melts at just over 1200°C

Boils at around 2000°C




Copper oxide is a base because it will react with acids and neutralise them, but it is notan alkali because it does not dissolve in water. Sodium hydroxide is a base because it will react with acids and neutralise them. It's also an alkali because it dissolves in water.







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Answer 2

alkali because its dissolved it.