Question

greenish layer appears on the copper utensils if they are not cleared for a few days give reason.​

Answer 1

Greenish layer appears on the copper utensils when they are kept open for few days because copper get corroded. Greenish layer is of Copper Carbonate (CuCO³)

Answer 2

$\huge\bf{\green{\mid{\overline{\underline{Answer}}}\mid}}$

$\bold{\small{\color{red}{Answer\:with\:explanation:}}}$

Copper metal slowly reacts with water, carbon dioxide and oxygen present in air to form a layer of basic copper carbonate which is a compound of copper hydroxide and copper carbonate. It is greenish in colour. This layer gets deposited on the surface of the copper metal.

$\bold{\small{\color{blue}{Reaction:}}}$

$2Cu + H_2O + CO_2 + O_2 ----> Cu(OH)_2.CuCO_3$