Post Utme Chemistry Past Questions and Answers

Question 696:

The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is

A. \(\mathrm{CO}_{2}, \mathrm{CO}_{2}\) and \(\mathrm{SO}_{2}\)
B. \(\mathrm{CO}, \mathrm{HCl}\) and \(\mathrm{SO}_{2}\)
C. \(\mathrm{SO}_{2}, \mathrm{CO}_{2}\) and \(\mathrm{HCl}\)

Question 697:

What is the shape of a molecule of \(\mathrm{CCI}_{4}\)?

A. Pyramid
B. Tetrahedral
C. Trigonal planar
D. Linear

Question 698:

A sample of a gas with in initial volume of \(2.5 \mathrm{dm}^{3}\) is heated and then allowed to expand to \(7.5 \mathrm{dm}^{3}\) at constant pressure. What is the ratio of the final temperature of the initial absolute temperature?

A. \(3: 1\)
B. \(1: 3\)
C. \(2: 5\)
D. \(5: 2\)

Question 699:

\(6 \mathrm{~g}\) of \(\mathrm{Mg}\) was added to \(100 \mathrm{~cm}^{3}\) of \(1 \mathrm{moldm}\). \({ }^{3} \mathrm{H}_{2} \mathrm{SO}_{4}\). What of \(\mathrm{Mg}\) remained undissolved?
\(\{M g=24\}\)

A. \(0.24 \mathrm{~g}\)
B. \(2.4 \mathrm{~g}\)
C. \(3.6 \mathrm{~g}\)
D. \(0.36 \mathrm{~g}\)

Question 700:

Which of the following will act as both oxidizing agent and reducing agent?

A. \(\mathrm{H}_{2} \mathrm{~S}\)
B. \(\mathrm{NH}_{3}\)
C. \(\mathrm{Cl}_{2}\)
D. \(\mathrm{SO}_{2}\)