Air Pollution: Causes, Effects and Control · NCERT Biology

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

  1. Lead increases the efficiency of the catalyst
  2. Lead in petrol inactivates the catalyst
  3. Lead petrol is too expensive for the converter
  4. Lead causes the exhaust to freeze
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Correct answer: Lead in petrol inactivates the catalyst

Lead in petrol acts as a poison for the precious metal catalysts in the converter. Using leaded petrol neutralizes the platinum, palladium, or rhodium, rendering the device ineffective at reducing pollution.

Difficulty: Medium Question 6 of 20

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