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JAMB Chemistry 1992 Question 30

Question 30

Carbon and its Compounds

Which of these statements is TRUE about carbon (IV) oxide?

  1. A.It supports combustion
  2. B.It is strongly acidic in water
  3. C.It is very soluble in water
  4. D.It supports the burning of magnesium to produce magnesium oxide.
Show the answer and explanation

Answer: D (It supports the burning of magnesium to produce magnesium oxide.)

Explanation

CO2 puts out most fires, but burning magnesium is hot enough to take the oxygen from it: 2Mg + CO2 → 2MgO + C. CO2 is only slightly soluble and forms a weak acid.