Question

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.​

Answer 1

Answer:

Copper react with moist carbon-dioxide in the air and slowly loses its shiny brown surface and gains a green coat. ... It displaces copper from copper sulphate solution and forms aluminium sulphate, leaving copper behind. Hence, the blue colour of copper sulphate disappear when some aluminium powder is added in it.

Explanation:

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Answer 2

Copper react with moist carbon-dioxide in the air and slowly loses its shiny brown surface and gains a green coat. ... It displaces copper from copper sulphate solution and forms aluminium sulphate, leaving copper behind. Hence, the blue colour of copper sulphate disappear when some aluminium powder is added in it.

Explanation:

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