Which of the following statements are correct in the context of carbon monoxide emissions?

1.Carbon monoxide is mainly due to incomplete combustion of fuel

2.It is more evident in petrol engines

3.Long-term exposure can cause nausea

A1 and 2 only

B1, 2 and 3 ✓ Correct

C2 and 3 only

D1 and 3 only

Correct answer: (B) 1, 2 and 3

Explanation

All three statements on carbon monoxide emissions are correct, covering their cause, source and health effect.

Statement 1 is right: carbon monoxide arises mainly from incomplete combustion of fuel.

Statement 2 is right: it is more prominent in petrol engines than in diesel ones.

Statement 3 is right: long-term exposure can bring on nausea and other symptoms.

Petrol engines run richer mixtures that leave more carbon partly oxidised to carbon monoxide.

The gas blocks oxygen transport by binding tightly to haemoglobin.

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