Question

Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from the outside. It may be due to:

• A. Proper combustion of fuel.
• B. Improper cooking of potato curry.
• C. Improper combustion of the fuel.
• D. Burning of the copper vessel.

Answer 1

The correct option is C

Improper combustion of the fuel.

Explanation for correct option:

Option C

Combustion:

• Combustion refers to the process where a substance burns in the presence of Oxygen, giving off heat and light in the process.
• Commonly used fuels like natural gas and propane generally consist of carbon and hydrogen.

Types of combustion:

Complete combustion:

• When the reaction takes place in the presence of abundant Oxygen, the substances combine with Oxygen to their maximum extent.
• Such reactions have heat and light as a visible by-products.

Incomplete combustion:

• These are defined as the reactions that occur in the absence of sufficient oxygen because of which substances are unable to burn completely.
• Such reactions leave Soot in the container due to this process along with the formation of Carbon monoxide which is an air pollutant.
• Copper vessel was getting blackened from the outside because of incomplete combustion of fuel.

Therefore option C is correct.