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Which of the following is//are the hazar...

Which of the following is`//`are the hazardous pollutant(s) present in automobile exhaust gases ?
(i) `N_(2)` (ii) `CO`
(iii) `CH_(4 )` (iv) Oxides of nitrogen

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The toxic elements present in automobile exhausts are carbon monoxide (CO), nitrogen oxides and particulate matter (fine carbon particles).
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