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JAMB Chemistry 1991 Question 37

Question 37

Carbon and its Compounds

Which of the following, in clear solution, forms a white precipitate when carbon (IV) oxide is bubbled into it for a short time?

  1. A.KOH
  2. B.NaOH
  3. C.Ca(OH)2
  4. D.Al(OH)3.
Show the answer and explanation

Answer: C (Ca(OH)2)

Explanation

Lime water, Ca(OH)2, turns milky with CO2 because insoluble CaCO3 forms. Potassium and sodium carbonates are soluble.