The normal rain water is slightly acidic and its $pH$ value is $5.6$ because of which one of the following?
- A$CO_2 + H_2O \rightarrow H_2CO_3$
- B$4NO_2 + O_2 + 2H_2O \rightarrow 4HNO_3$
- C$2SO_2 + O_2 + 2H_2O \rightarrow 2H_2SO_4$
- D$N_2O_5 + H_2O \rightarrow 2HNO_3$
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