POST UTME ACHIEVERS UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A colloidal solution of starch in water is prepared by adding 2 g of starch to 100 mL of water. What is the concentration of the solution in terms of mass percentage?
A. 2%
B. 5%
C. 10%
D. 15%
Question 2
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the volume of NaOH required to reach the equivalence point?
A. 50 mL
B. 100 mL
C. 150 mL
D. 200 mL
Question 3
A 0.500 M solution of NaOH is titrated with a 0.500 M solution of HCl. Calculate the pH of the solution after 25.0 mL of HCl has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 4
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 5
The rate cons\tant for a reaction is 0.05 s^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 6
A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in water. What is the volume of the solution in liters?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 7
A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 8
A metal (M) reacts with hydrochloric acid (HCl) to produce hydrogen gas and a salt. The reaction is as follows: \text{M} + 2\text{HCl} \rightarrow \text{MCl}_2 + \text{H}_2. What is the name of the metal?
A. Zinc (Zn)
B. Iron (Fe)
C. Copper (Cu)
D. Silver (Ag)
Question 9
A 2.0 g sample of a polymer is dissolved in 100 mL of a solvent. The solution is then titrated with a 0.1 M NaOH solution. If 25 mL of the NaOH solution is required to reach the equivalence point, what is the molar mass of the polymer?
A. 1000 g/mol
B. 2000 g/mol
C. 3000 g/mol
D. 4000 g/mol
Question 10
Calculate the molar mass of a compound that contains 40% carbon and 60% oxygen by mass.
A. 60
B. 80
C. 100
D. 120
Question 11
The electrolysis of a solution of silver nitrate (AgNO3) in water produces silver metal and nitrogen dioxide gas. Write the half-equation for the oxidation of silver ions at the anode.
A. \text{Ag}^+ + \text{e}^- \rightarrow \text{Ag}
B. \text{Ag}^+ + \text{H}_2\text{O} \rightarrow \text{Ag} + \text{H}^+
C. \text{Ag}^+ + \frac{1}{2} \text{H}_2\text{O} \rightarrow \text{Ag} + \frac{1}{2} \text{H}_2\text{O} + \text{e}^-
D. \text{Ag}^+ + \text{e}^- \rightarrow \text{Ag} + \text{H}^+
Question 12
The polymerization of styrene to polystyrene is an example of a ______ reaction.
A. Condensation
B. Addition
C. Substitution
D. Elimination
Question 13
A polymer is formed by the condensation reaction between two monomers, A and B. If 2.5 g of A and 3.2 g of B are used, and the molecular weight of A is 120 g/mol and that of B is 180 g/mol, what is the number of moles of the polymer formed?
A. 0.021 mol
B. 0.025 mol
C. 0.032 mol
D. 0.040 mol
Question 14
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 50 mL of NaOH?
A. pH 1
B. pH 2
C. pH 3
D. pH 4
Question 15
A sample of polystyrene (PS) has a density of 1.05 g/cm³ and a molecular weight of 104 g/mol. Calculate the molar volume \( V_m \) of PS.
A. 0.098 m³/mol
B. 0.0985 m³/mol
C. 0.099 m³/mol
D. 0.0995 m³/mol

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: