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Explain the principle behind the usage o...

Explain the principle behind the usage of electric precipitators in industries and catalytic converters in automobiles for controlling air pollution.

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Electric precipitator removes the suspended particulate matter which are charged particles coming from thermal power plants, cement plants, steel plants so that smoke and ash entering the atmosphere is minimised. Catalytic converter contains catalysts such as platinum on ceramic comb which convert harmful gases to less harmful gases, such as CO to `CO_2` and oxides of nitrogen to nitrogen.
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