Short Answer TypeWhy is it desirable to use unleaded petrol in vehicles fitted with catalytic converters?
Explain the relationship between CFCs and Ozone in the stratosphere.
CFCs find wide use as refrigerants. CFCs discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them reacting with the Cl atoms. Cl atoms acts as catalysts and degrades ozone releasing molecular oxygen. Cl atoms are not consumed in the reaction. Hence whatever CFC are added to stratosphere, have permanent and continuing effects on ozone level. 
(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.
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.
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