POST UTME CALEB UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of sodium chloride is electrolyzed u\sing a current of 2.5 A for 2 hours. Calculate the mass of chlorine gas produced at the cathode.
A. 0.5 g
B. 1.0 g
C. 1.5 g
D. 2.0 g
Question 2
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 3
The diagram below represents a periodic table. Identify the group to which the element 'X' belongs.
A. Group 1
B. Group 2
C. Group 17
D. Group 18
Question 4
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 5
A metal 'X' reacts with dilute hydrochloric acid to produce a gas 'Y'. The gas 'Y' is used in the manufacture of a common household product. Identify the metal 'X' and the household product.
A. Zinc and bleach
B. Iron and hydrogen peroxide
C. Copper and ammonia
D. Lead and sodium hydroxide
Question 6
A 1.0 M solution of ethanol (C2H5OH) is mixed with a 1.0 M solution of water (H2O) in a 1:1 mole ratio. What is the expected pH of the resulting solution?
A. 0
B. 1
C. 2
D. 7
Question 7
A polymer chain has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 100 g/mol
B. 200 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 8
A sample of a non-metallic oxide has a mass of 2.5 g and a volume of 2.5 cm³. If the density of the oxide is 3.5 g/cm³, calculate the number of moles of oxygen present in the sample.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 9
A solution of 0.1 M NaOH is mixed with a solution of 0.2 M HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 10
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 11
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 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
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 250 cm³ of water. Calculate the number of moles of NaCl that will be present in 50 cm³ of this solution.
A. 0.001 mol
B. 0.002 mol
C. 0.005 mol
D. 0.01 mol
Question 14
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 15
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4

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