a green solid which on decomposing gives carbon-di-oxide

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Solution

Copper carbonte when heated decomposes to give copper oxide and carbon dioxide.
It changes from green to black in color when heated.

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a green solid which on decomposing gives carbon-di-oxide

Copper carbonte when heated decomposes to give copper oxide and carbon dioxide. It changes from green to black in color when heated.

Copper carbonte when heated decomposes to give copper oxide and carbon dioxide.
It changes from green to black in color when heated.