Which of the following groups contains only substances which are pollutants?
(a) carbon monoxide, sulphur dioxide, smoke
(b) sulphur dioxide, oxygen, nitrogen
(c) carbon dioxide, nitrogen, argon
(d) carbon monoxide, sulphur dioxide, neon
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Solution
(a) carbon monoxide, sulphur dioxide, smoke All of them are hazardous to health; therefore, they are pollutants.