Question

‘A student while walking on the road observed that a cloud of black smoke belched out from the exhaust stack of moving trucks on the road.’ Choose the correct reason for the production of black smoke:

Options

• Limited supply of air leads to incomplete combustion of fuel.

• Rich supply of air leads to the complete combustion of fuel.

• Rich supply of air leads to a combination reaction.

• Limited supply of air leads to complete combustion of fuel.

Answer 1

Limited supply of air leads to incomplete combustion of fuel.