Question

When copper utensils are kept in moist air, then a layer deposits on it. Write the
colour of this layer and mention the chemical name involved in it.

Answer 1

Explanation:

When a copper vessel is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide.

Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.

The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). The following is the reaction:

2Cu(s)+H

2

O(g)+CO

2

+O

2

→Cu(OH)

2

+CuCO

3

(s)

Copper(II) carbonate is a blue-green compound.

Answer 2

Answer:

THE ANSWER IS AS FOLLOWS

Explanation:

IT IS GREEN IN COLOUR

CHEMICAL NATURE = BASIC COPPER CARBONATE

                                    BASIC IN NATURE

MADE UP OF CALCIUM CARBONATE AND CALCIUM HYDROXIDE