Post Utme Federal University of Technology, Akure Chemistry Past Questions and Answers

Question 1:

\(\mathrm{Mg}_{\mathrm{g}}+2 \mathrm{HCl}_{\text {we }} \mathrm{MgCl}_{\text {ibes }}+\mathrm{H}_{\text {wat }}\) From the equation above, what mass of hydrogen would be produced if \(12.0 \mathrm{got}\) magnesium reacted completely with dilute hydrochloric acid? (H=1, Mg=24)

A. \(1 .0 \mathrm{~g}\)
B. \(2.0 \mathrm{~g}\)
C. \(6 .0 \mathrm{~g}\)
D. 12.0g

Question 2:

Alkanols have unexpectedly high boiling points relative to their molar masses because of intermolecular ____________

A. Hydrogen bonding.
B. Metallic bonding.
C. Covalent bonding.
D. Ionic bonding.

Question 3:

If an element \(x\) with electronic configuration \(2,8,3\), combines with another element \(z\) with electronic configuration \(2,8,6\), the compound formed will have the formula ____________

A. \(X Z\).
B. \(X Z, \quad\)
C. \(X_{7} Z \quad\)
D. \(X_{2} Z_{3}\)

Question 4:

Which of the following molecules is linear in shape?

A. CH.
B. \(\mathrm{H}_{3} 0 \quad \)
C. \(\mathrm{H}_{2} \mathrm{~S} \quad\)
D. Cl,

Question 5:

What is the percentage by mass of copper in copper (1) oxide \(\left(\mathrm{Cu}_{2} \mathrm{O}\right) ?[0=16, \mathrm{Cu}=64]\)

A. \(88.9 \%\)
B. \(80.0 \%\)
C. \(66.7 \%\)
D. \(20.0 \%\)