Introduction to Pollution & Types Past Year (2016 - 2018) MCQs Environmental Issues (OLD NCERT) Botany NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Which of the following is a secondary pollutant?

$1 .$ $CO$
$2 .$ ${CO}_{2}$
$3 .$ ${SO}_{2}$
$4 .$ $O_{3}$

Subtopic: Introduction to Pollution & Types |

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