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NEET levelSingle correct optionDifficulty 1 of 3ev002

The pH of normal (unpolluted) rain water is about 5.6. This slight acidity is due to the dissolved

A $O X_{3}$ , forming ozonic acid
B $NO X_{2}$ , forming nitric acid
C $SO X_{2}$ , forming sulphurous acid
D $CO X_{2}$ , forming carbonic acid

Answer: D

Atmospheric carbon dioxide dissolves in water:

CO X_{2} + H X_{2} O H X_{2} CO X_{3}

, and carbonic acid ionises weakly to give a pH near 5.6. Oxides of sulphur and nitrogen are the pollutants that push the pH below 5.6.

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