2. a) A green layer is gradually formed on a copper plate when left exposed to air for a week. What could a green substance be? b) Explain why Aluminium oxide is considered as an amphoteric oxide.
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2. a) A green layer is gradually formed on a copper plate when left exposed to air for a week. What could a green substance be? b) Explain why Aluminium oxide is considered as an amphoteric oxide.
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Answer:
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