Correct answer: (a) Both Statement-II and Statement-III are correct and both of them explain Statement-I
Explanation
- A
Both Statement-II and Statement-III are correct and both of them explain Statement-I
Both II and III correct and both explain I. Rain weathers rock via dissolved CO2 (carbonation) and dissolved O2 (oxidation).
- B
Both Statement-II and Statement-III are correct, but only one of them explains Statement-I
Both II and III correct but only one explains I. Both processes are weathering routes.
- C
Only one of the Statements II and III is correct and that explains Statement-I
Only one of II/III correct. Both chemical facts are true.
- D
Neither Statement- II nor Statement-Ill is correct
Neither II nor III correct. Rainwater does carry CO2 and O2.
Summary. Official key is (a). Rainfall weathers rocks. Rainwater dissolves atmospheric carbon dioxide to form weak carbonic acid (carbonation of limestone and silicates) and carries dissolved oxygen (oxidation of iron-bearing minerals). Both II and III are true and both explain I.
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