Q. Consider the following statements regarding use of lead in petrol:
1. It was added to petrol since introduction of lead has high anti-knock and octane boosting properties.
2. Lead is very toxic to human health but improves the efficiency of emission control system of vehicles.
3. All the countries around the world now use lead free petrol.
Which of the statements given above is/are correct?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] All of the above

Answer: C
Notes:

Statement 2 is incorrect: Lead is harmful to both human health as well as emission control system of vehicles 

Statement 1 is correct: Due to its anti-knock, octane boosting properties, lead was added to petrol in the past 

Statement 3 is correct: Recently, Algeria became the last country to introduce lead free petrol 

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