Which one of the following air pollutants combines with the haemoglobin of human blood and reduces its oxygen- carrying capacity, leading to suffocation and may cause even death?

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Q: 5 (CDS-II/2016)

Which one of the following air pollutants combines with the haemoglobin of human blood and reduces its oxygen- carrying capacity, leading to suffocation and may cause even death?
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question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,41,46,9,5,69,4

keywords: 

{'air pollutants': [0, 0, 0, 2], 'carbon monoxide': [3, 0, 1, 1], 'chlorofluorocarbon': [1, 0, 0, 6], 'haemoglobin': [10, 1, 0, 2], 'sulphur dioxide': [0, 0, 0, 1], 'human blood': [1, 0, 0, 1], 'fly ash': [0, 0, 0, 1], 'suffocation': [0, 0, 0, 1], 'death': [5, 3, 6, 7]}