POST UTME OSUSTECH 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25.0 mL sample of 0.100 M HCl is added to a 100.0 mL sample of 0.0100 M NaOH. What is the concentration of the resulting solution?
A. 0.00500 M
B. 0.0100 M
C. 0.0150 M
D. 0.0200 M
Question 2
A solution of 0.1 M H2SO4 is mixed with a solution of 0.1 M NaOH. If the reaction is allowed to proceed until equilibrium is reached, what is the concentration of H2SO4 remaining in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 3
A metal M has a s\tandard electrode potential of +0.5 V. If a solution of 0.1 M M^2+ is mixed with a solution of 0.1 M Ag^+, what is the concentration of Ag+ remaining in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 4
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. If the reaction is allowed to proceed until equilibrium is reached, what is the concentration of HCl remaining in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 5
The atomic radius of an element is 100 pm. If the element is in the 4th period of the periodic table, what is the value of the principal quantum number (n) for the element?
A. 3
B. 4
C. 5
D. 6
Question 6
A diagram of a titration setup is shown below. What is the concentration of the NaOH solution?
A. 0.100 M
B. 0.0100 M
C. 0.00100 M
D. 0.000100 M
Question 7
A metal M has a s\tandard electrode potential of +0.5 V. If a solution of 0.1 M M^2+ is mixed with a solution of 0.1 M Cu^2+, what is the concentration of Cu^2+ remaining in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 8
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of vaporization of 1.00 mol of H2O(l) to form H2O(g)?
A. -285.8 kJ
B. -285.8 kJ/mol
C. -285.8 kJ/mol × 1.00 mol
D. -285.8 kJ/mol × 1.00 mol × 1.00
Question 9
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 10
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylbu\tane
C. 2-chloro-3-methylbu\tane
D. 2-chloro-3-methylpen\tane
Question 11
The reaction between chlorine gas and potassium iodide is a classic example of a redox reaction. Which of the following is the correct representation of the reaction in terms of half-equations?
A. \\text{Cl}_2 + 2\\text{e}^- \\rightarrow 2\\text{Cl}^-
B. 2\text{KI} \rightarrow \text{I}_2 + 2\text{K}^+
C. \text{Cl}_2 + 2\text{KI} \rightarrow 2\text{KCl} + \text{I}_2
D. 2\\text{Cl}^- \\rightarrow \\text{Cl}_2 + 2\\text{e}^-
Question 12
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase?
A. to separate the components of a mixture
B. to identify the components of a mixture
C. to purify a subs\tance
D. to analyze the properties of a subs\tance
Question 13
A 1.8 M solution of sodium sulfate is prepared by dissolving 144.0 g of sodium sulfate in 1 L of water. What is the concentration of the solution in terms of molarity?
A. 1.8 M
B. 3.6 M
C. 5.4 M
D. 7.2 M
Question 14
A 2.2 M solution of calcium chloride is prepared by dissolving 148.0 g of calcium chloride in 1 L of water. What is the concentration of the solution in terms of molarity?
A. 2.2 M
B. 4.4 M
C. 6.6 M
D. 8.8 M
Question 15
The reaction of an alkene with bromine is a test for the presence of a double bond. What is the major product of this reaction?
A. an alkane
B. an alkene
C. an alkyne
D. a dibromide

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