POST UTME CALEB UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The polymerization of styrene to polystyrene involves the addition of a monomer to a growing polymer chain. Which of the following is the most likely mechanism for this reaction?
A. Free radical polymerization
B. Cationic polymerization
C. Anionic polymerization
D. Coordination polymerization
Question 2
The rate cons\tant of 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 after 10 min?
A. 0.01
B. 0.02
C. 0.03
D. 0.04
Question 3
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the solution after the addition of 25.0 mL of NaOH is 8.50, what is the concentration of the NaOH solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 4
A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1.0 dm³ of water. Calculate the number of moles of HCl that will be present in 250 cm³ of this solution.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 5
What is 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-2-methylpen\tane
D. 2-chloro-2-methylhexane
Question 6
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 1
B. 2
C. 3
D. 4
Question 7
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 8
A 2.00 g sample of a metal is heated in a stream of oxygen gas. If the mass of the metal is reduced to 1.50 g after the reaction, what is the empirical formula of the metal oxide?
A. MgO
B. CaO
C. Fe2O3
D. CuO
Question 9
A sample of a metal (X) reacts with oxygen to form a white solid. The reaction is as follows: 4X + 3O2 → 2X2O3. What is the molar mass of the metal (X)?
A. 40 g/mol
B. 60 g/mol
C. 80 g/mol
D. 100 g/mol
Question 10
A 1.0 M solution of glu\cose (C6H12O6) is prepared by dissolving 36 g of glu\cose in 100 mL of water. What is the concentration of glu\cose in the solution in g/L?
A. 36 g/L
B. 72 g/L
C. 108 g/L
D. 144 g/L
Question 11
A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. What is the partial pressure of O2 in the sample at a total pressure of 1 atm?
A. 0.2 atm
B. 0.3 atm
C. 0.4 atm
D. 0.5 atm
Question 12
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 1
B. 2
C. 3
D. 4
Question 13
The diagram below represents a titration setup. Identify the subs\tance being titrated.
A. NaOH
B. HCl
C. H2SO4
D. HNO3
Question 14
A metal alloy is composed of 80% copper and 20% zinc. If the density of the alloy is 8.5 g/cm^3, what is the expected density of the copper component?
A. 8.5 g/cm^3
B. 9.0 g/cm^3
C. 9.5 g/cm^3
D. 10.0 g/cm^3
Question 15
A mixture of 2.5 g of an unknown hydrocarbon and 2.5 g of anhydrous CaCl2 was dissolved in 25 mL of diethyl ether. The solution was then titrated with 0.1 M AgNO3. The reaction was monitored u\sing a burette, and the volume of AgNO3 required to reach the equivalence point was 15 mL. Calculate the molar mass of the hydrocarbon.
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol

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