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AIIMS 2009

Exam: AIIMS
Year: 2009
Subject: Botany
Chapter: Environmental Issues

AIIMS 2009 · Botany · Environmental Issues

Rain is called acid-rain when its pH is below

Rain is called acid-rain when its

\mathrm{pH}

is below

Options

A $7$
B $6.5$
C $6$
D5.6.

Correct answer

D. 5.6.

Step-by-step solution

Acid rain is rainfall and other forms of precipitation with a

\mathrm{pH}

less than

5 . \mathrm{pH}

of normal rain is

5.6-6.5

. It is caused by the large scale emission of acidic gases into the atmosphere from thermal power plants, industries and automobiles.

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