Question

Seema's grandfather filled a copper glass with water and kept it aside. He forgot about this glass.After a few days, he found a dull green coating on the glass. Seema was surprised. Her grandfather told her that this layer contains a mixture of

Answer 1

Answer:

Its the mixture of copper carbonate or copper hydroxide

Answer 2

Answer: It is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3)

Explanation: When copper is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). The following is the reaction

2Cu+H2O+CO2+O2=Cu(OH)2+CuCO3