Question

the chemical compound responsible for green deposit on the surface of article of copper

Answer 1

When a copper article is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide and copper carbonate.

Answer 2

Copper metal when exposed to air turns green in colour due to corrosion. Thus, when copper vessels are exposed to air in rainy season for sometime, the metal reacts with gases and moisture present in air to form a mixture of copper carbonate and copper hydroxide [(CuCO3). Cu(OH)2]. This gives a green colour to the vessels.

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