Post Utme University of Ibadan Chemistry Past Questions and Answers

Question 1:

Citrus fruits such as lemon and grape taste sour because they contain

A. Ascorbic acid and citric acid
B. Citric acid and ascetic acid
C. Citric acid and dilute \(\mathrm{HCl}\)
D. Citric acid and salicyclic acid
E. Sulphuric acid

Question 2:

Soap lather is an example of a colloid in which a ____________

A. Liquid is dispersed in gas
B. Solid is dispersed in liquid
C. Gas is dispersed in liquid
D. Liquid is dispersed in liquid

Question 3:

The air around a petroleum refinery is most likely to contain ____________

A. \(\mathrm{CO}_{2}, \mathrm{SO}_{3}\) and \(\mathrm{N}_{2} \mathrm{O}\)
B. \(\mathrm{CO}_{2}, \mathrm{CO}_{\mathrm{C}} \mathrm{C}\) and \(\mathrm{N}_{2} \mathrm{O}\)
C. \(\mathrm{SO}_{2}, \mathrm{CO}\) and \(\mathrm{NO}_{2}\)
D. \(\mathrm{PH}_{3}, \mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{CO}_{2}\)

Question 4:

The difference between colloids and suspensions is brought out clearly by the fact that while colloids ____________

A. Do not scatter light, suspensions do
B. Can be separated by filtration, suspensions cannot be so separated
C. Can be separated by a membrane, suspensions cannot
D. Do not settle out on standing, suspensions do

Question 5:

\(0.16 \mathrm{~g}\) of methane when burnt increases the temperature of \(100 \mathrm{~g}\) of water by \(40^{\circ}(\mathrm{C})\), what is the heat of combustion of methane if the heat capacity of water is \(4.2 \mathrm{Jg}^{-10} \mathrm{C}^{-1}\) ? \(\left(\mathrm{CH}_{4}=16 \right)\).

A. \(1,160 \mathrm{kJmol}^{-1}\)
B. \(1,180 \mathrm{kJmol}^{-1}\)
C. \(1,560 \mathrm{kJmol}^{-1}\)
D. \(1,600 \mathrm{kJmol}^{-1}\)
E. \(1,680 \mathrm{kJmol}^{-1}\)