GATE 2017 CE (CE1) – Question 25

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

Which of the following is NOT present in acid rain in the conventional classification used here?

$\mathrm{HNO_3}$
$\mathrm{H_2SO_4}$
$\mathrm{H_2CO_3}$
$\mathrm{CH_3COOH}$

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Correct answer: (D) $\mathrm{CH_3COOH}$

Explanation

The intended acid-rain constituents are nitric and sulphuric acids from atmospheric nitrogen and sulphur oxides, together with carbonic acid from dissolved carbon dioxide. The archived key therefore chooses acetic acid, D. This is a textbook classification rather than a universal analytical absence: organic acids, including acetic acid, can occur in real precipitation.

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