Why is the use of unleaded petrol recommended for vehicles equipped with catalytic converters?

Why should only unleaded petrol be used in the automobiles with catalytic converter?

Explain briefly : Catalytic converters

Name any two metals used in the catalytic converters of automobiles.

Discuss briefly the following: Catalytic converter

List two advantages of the use of unleaded petrol in automobiles as fuel.

Observe the diagram of the catalytic converter and answer the questions which follow: name any two metals used as catalyst in the catalytic converter.

Why are tall chimneys recommended for factories?

Use of lead-free petrol or diesel is recommended to reduce the pollutants emitted by the automobiles. What role does lead play?