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The pH of pure water is 7 but the pH of ...

The pH of pure water is 7 but the pH of rain water is less than 7. This is due to

A

`1`. Rain water contains some salts

B

`2`. Gases like `CO_2` dissolved in water and becomes basic

C

`3`. Gases like `CO_2`, dissolved in water and becomes acidic

D

`4`. Dust particles are dissolved and becomes acidic

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