Answer
When rain water descend from clouds to earth, it got mixed with CO2 present in the air and forms carbonic acid, which is a weak acid. Hence rain water is acidic in nature.
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Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 18 - Chemistry of the Environment - Exercises - Page 806: 18.28
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