Post Utme Chemistry Questions
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 \(1,680 \mathrm{kJmol}^{-1}\)