Question

Shweta always cleans her utensils properly yet she observes a black layer at the bottom of the utensil. Why is it so?

• A. Because of the burning of steel.
• B. Because of the burning of water particles below the utensil
• C. Because of the incomplete combustion of oxygen.
• D. None of these

Answer 1

The correct option is C

Because of the incomplete combustion of oxygen.

The presence of black coating in the lower portion of the utensil is the soot that has accumulated because of the incomplete combustion of oxygen.
Incomplete combustionoccurs when the supply of air or oxygen is poor. Water is still produced, but carbon monoxide and carbon are produced instead of carbon dioxide.