Post-UTME Chemistry 2018 Objective — Question 14
Question 14 of 21 from the Post-UTME Screening (Post-UTME) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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When carbon (IV) oxide is bubbled into lime water, a white precipitate is first formed, which later dissolves in excess CO2 to form a colourless solution. The white precipitate and the soluble compound formed in the reactions are respectively
- A. Na2CO3 and NaHCO3
- B. Na2CO3 and CaCl2
- C. Ca(OH)2 and CaCO3
- D. CaCO3 and Ca(HCO3)2Correct
Explanation
CO2 first forms insoluble CaCO3 with limewater; with excess CO2, this converts to soluble calcium hydrogencarbonate, Ca(HCO3)2.
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