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AIIMS 2014
Exam
AIIMS
Year
2014
Subject
Botany
Chapter
Environmental Issues

AIIMS 2014 · Botany · Environmental Issues

Photochemical smog formed in congested metropolitan cities mainly...

Photochemical smog formed in congested metropolitan cities mainly consists of

Options

  1. Aozone, peroxyacyl nitrate and NOx\mathrm{NO}_{\mathrm{x}}
  2. Bsmoke, peroxyacyl nitrate and SO2\mathrm{SO}_2
  3. Chydrocarbons, SO2\mathrm{SO}_2 and CO2\mathrm{CO}_2
  4. Dhydrocarbons, ozone and SOx\mathrm{SO}_{\mathrm{x}}.

Correct answer

A. ozone, peroxyacyl nitrate and NOx\mathrm{NO}_{\mathrm{x}}

Step-by-step solution

Photochemical smog is a grey or yellowish brown opaque smog having oxidizing environment but little smokes. It is formed at high temperature over cities and towns due to still air, emission of NO2\mathrm{NO}_2 oxides and hydrocarbons from automobile exhausts. Nitrogen dioxide splits into nitric oxide and nascent oxygen. Nascent oxygen combines with molecular oxygen to form ozone. Ozone reacts with hydrocarbons to form aldehydes and ketones. Nitrogen oxides, oxygen and ketones combine to form peroxy-acyl-nitrates (PAN).
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