WAEC Biology 2020 Objective — Question 23
Question 23 of 50 from the West African Examinations Council (WAEC) Biology 2020 Objective paper, with the correct answer and a full explanation.
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The reagent used in testing for carbon (IV) oxide is
- A. copper sulphate solution
- B. lime waterCorrect
- C. hydrochloric acid
- D. sodium hydroxide solution
Explanation
The reagent used in testing for carbon (IV) oxide is lime water. Carbon (IV) oxide is known to turn lime water milky.
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