Neutral water with pH 7 becomes slightly acidic when aerated. This is because

Options :
  1. oxygen from air is dissolved in the water which makes the water acidic
  2. dirt, which get contaminated with the water makes the water acidic
  3. ultraviolet radiation dissociates water molecules and makes water acidic
  4. carbon dioxide from air is dissolved

Answer and Explanation :-

Answer: Option 4


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