Criteria for rain water to be called acid rain, ⁣ $fs$ for pH:

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< 7.0

< 1.0

< 6.0

< 5.6

answer is A.

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Detailed Solution

Criteria for rain water to be called acid rain, $fs$ for pH is 5.6.

Though the pH of neutral water is 7, rain water is acidic owing to interacting with atmospheric carbon dioxide and is stated to have a pH of 5.6. As a result, acid rain has a pH of less than 5.6.

Therefore, option A is correct.

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