Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters?

Mention two advantages for preferring CNG over diesel as an automobile fuel.

Explain the relationship between CFCs and Ozone in the stratosphere.

Excessive nutrients in a fresh water body cause fish mortality. Give two reasons

(a) Name any two places where it is essential to install electrostatic percipitators. Why is it required to do so?

(b) Mention one limitation of the electrostatic precipitator.

99.

How do algal blooms affect the life in water bodies? 

A. State the consequence if the electrostatic precipitator of a thermal plant fails to function.

B. Mention any four methods by which the vehicular air pollution can be controlled.