Out of `SO_(2),CO, O_(3),NO` and peroxyacetylnitrate (PAN) primary and secondary pollutants are

Options

A. Primary=`SO_(2),O_(3),NO`, Secondary=`CO,PAN`
B. Primary=`SO_(2),NO`, Secondary=`,PAN,O_(3),CO`
C. Primary=`SO_(2),CO,NO`, Secondary=`PAN,O_(3)`
D. Primary=`PAN,O_(3)`, Secondary=`SO_(2),CO,NO`

Answer

C

Explanation

Objectionable materials that are emitted directly into the atmosohere by identifiable sources are called primary pollutants as `SO_(2), SO_(3), CO, NO`.
Secondary pollutants are those which are formed in the atmosphere as a result of some chemical rections between matter already present.
`O_(3), HCHO, PAN`.