question_answer

Read the following statements carefully.

1. Photochemical smog always contains ozone.

2. The toxic effect of carbon monoxide is due to its greater affinity for haemoglobin as compared to oxygen.

3. Lead is the most hazardous metal pollutant of automobile exhaust.

Which of the above statements is not true?

A)  1                    

B)  2                    

C)  3                    

D)         None of these