TGPSC HMWSSB Manager 2015 Paper 2 · Question 85
Question 85 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.
Which one of the following pollutant (or) pairs of pollutants is formed due to photochemical reactions
- CO alone
- O₃ and PAN
- PAN and NH₃
- NH₃ and CO
Show answer
Answer: (2) O₃ and PAN
Ozone and peroxyacetyl nitrate (PAN) are secondary pollutants formed when sunlight acts on nitrogen oxides and hydrocarbons (photochemical smog); CO and NH₃ are emitted directly as primary pollutants.