Bronze statues and articles of copper slowly tarnish in air and turn green. This green colour is due to the formation of:

basic copper sulphate

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an oxalate

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copper sulphate

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copper oxide

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Solution

The correct option is A basic copper sulphate
Copper becomes green after some time due to its exposure to air. Copper reacts with carbon-dioxide and moisture present in air first forming cupric hydroxide and then basic copper carbonate. This compound is green in colour.
Hence option A is correct answer.

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