Normal rain water is slightly acidic because of which of the following reaction:

a)  CO2 + H2O —–> H2CO3
b)  4NO2 + O2 + 2H2O —–> 4HNO3
c)  2SO2 + O2 + 2H2O —–> 2H2SO4
d)  N2O5 + H2O —–> 2HNO3

Answer: a) CO2 + H2O —–> H2CO3

Explanation: Normal rainwater is slightly acidic with a pH value of 5.6 due to the presence of carbon dioxide (CO2) in the atmosphere. When carbon dioxide reacts with water, it forms carbonic acid (H2CO3), which contributes to the acidity of rainwater.
The reaction can be represented as follows:  CO2 + H2O → H2CO3

rain water is slightly acidic

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