When you heat a China dish containing 1 gm of Copper powder, a Black substance is formed on the surface of the powder due to:

 When you heat a China dish containing 1 gm of Copper powder, a Black substance is formed on the surface of the powder due to:

1

Atomization

2

Carbonization

3

Oxidation

Correct Answer

4

Desalinization

The correct answer is Oxidation.

• In this situation, copper reacts with oxygen in presence of air and formed copper oxide.
• Reaction equation: 2Cu(s) + O2 (g) = 2CuO (s).

Important Points 

Atomization	It is a spray method. The process of breaking up bulk liquids into droplets.
Carbonization	A process in which fuel is heated (900–1,200 °C) without air to leave solid porous carbon. By this process, cole creates coke and sub byproducts.
Desalinization	It is a process that takes away mineral components and salts from saline water. Changing seawater into potable water by a chemical process.