Post Utme Chemistry Past Questions and Answers

Question 66:

Which of the following is not allotrope of carbon?

A. Diamond
B. Graphite
C. Buck minsterfullerene
D. All of the above
E. None of the above

Question 67:

Which oxide is amphiprotic (amphoteric)?

A. \(\mathrm{MgO}\)
B. \(\mathrm{NaO}\)
C. \(\mathrm{CaO}\)
D. \(\mathrm{ZnO}\)
E. \(\mathrm{BeO}\)

Question 68:

Why will it always be more difficult to extract potassium ions from sea water than to extract magnesium ions? This is because ____________

A. Most potassium compounds are less soluble in water
B. Most potassium compounds are quite soluble in water
C. Presence of other alkali metal ions has great influence on it
D. Magnesium ion is an alkaline earth metal ion.
E. None of the above

Question 69:

____________ can be used to test for reducing sugars:

A. Iodine solution
B. Bromine water
C. Fehling's solution
D. De-ionized water

Question 70:

\(2 \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{Zn} rightarrow\) ? The product of this reaction is ____________

A. \(\left(\mathrm{CH}_{3} \mathrm{COO} right)_{2} \mathrm{Zn}+\mathrm{Zn}
B. \(\mathrm{CH}_{3} \mathrm{COO} \mathrm{CH}_{3}+\mathrm{C}^{2}\) \(\mathrm{Zn}\)
C. \(\left(\mathrm{CH}_{3} \mathrm{COO} \right)_{2} \mathrm{Zn}+\mathrm{H}_{2}\)
D. \(\mathrm{CH}_{3} \mathrm{COOH}+\mathrm{CH}_{4}\)