Which reaction accounts for the fact that the pH of rain is naturally slightly acidic?
A) CO2 + H2O → H+ + HCO3¯
B) SO3 + H2O → 2 H+ + SO42¯
C) Ca2+ + CO2 + H2O → CaCO3 + 2 H+
D) NO2 + H2O → 2 H+ + NO3¯
Correct Answer:
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