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प्रश्न
pH of acid rain is sometimes as low as 2. Explain.
उत्तर
Normal rain is only slightly acidic having a pH of about 5.6.
This is because carbon dioxide reacts with it to form weak carbonic acid.
CO2 + H2O → H2CO3
pH of acid rain usually ranges between 5.6 and 3.5; at times, it can be as low as 2.
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