GATE Exam Questions - Engineering

Q1:

Two primary air pollutants are

A sulphur oxide and ozone

B nitrogen oxide and peroxyacetylnitrate

C sulphur oxide and hydrocarbon

D ozone and peroxyacetynitrate

ANS:C - sulphur oxide and hydrocarbon

Peroxyacetyl nitrate is a peroxyacetyl nitrate. It is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into phenoxyethanol radicals and nitrogen dioxide gas. It is a lachrymatory substance.