WBCS.LIVE practice question

The pH of fresh ground water slightly decreases upon exposure to air because

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. carbon dioxide from air is dissolved in the water
  2. oxygen from air is dissolved in the water
  3. the dissolved carbon dioxide of the ground water escapes into air
  4. the dissolved oxygen of the ground water escapes into air

Correct answer and explanation

Correct answer: carbon dioxide from air is dissolved in the water