Discussion
Three-way catalytic converter is used in vehicles to reduce
1. Unburnt Hydrocarbon
2. Carbon Monoxide
3. Nitric Oxide
4. Sulphur dioxide
Select the correct answer using the code given below :
Answer: A
A three-way converter reduces hydrocarbons, carbon monoxide and nitric oxide, so the answer is Only 1, 2, and 3.
The converter is called three-way because it handles three pollutants at once. Platinum and palladium catalysts oxidise unburnt hydrocarbons and carbon monoxide to carbon dioxide and water, and rhodium reduces oxides of nitrogen such as nitric oxide to nitrogen.
It does not remove sulphur dioxide; sulphur in fuel actually poisons the catalyst, which is why low-sulphur fuel is needed. So every option including 4 is wrong.
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