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Unilorin Post-UTME Chemistry 2022 (Model questions) Question 3

Question 3

Air

Oxygen in air can be removed using

  1. A.lime water
  2. B.caustic soda solution
  3. C.pyrogallol solution
  4. D.slaked lime
Show the answer and explanation

Answer: C (pyrogallol solution)

Explanation

Alkaline pyrogallol absorbs oxygen. Lime water and caustic soda absorb carbon(IV) oxide instead.