Why does rain water containing Carbonic acid have lower ph than the rainwater containg sulpuric acid ?

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Solution

Rain water containing sulphuric acid has lower pH than rain water containing carbonic acid because sulphuric acid is a strong acid and carbonic acid is a weak acid. Presence of carbonic acid in rain water can lower pH to a minimum of 5.6 whereas sulphuric acid can lower pH below 5.

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