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

Options

  1. Aoxygen from air is dissolved in the water which makes the water acidic
  2. Bdirt, which get contaminated with the water during aeration makes the water acidic
  3. Cultraviolet radiation dissociates water molecules and makes water acidic
  4. Dcarbon-dioxide from air is dissolved

Correct answer

D. carbon-dioxide from air is dissolved

Step-by-step solution

The correct answer is option (D).

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