POST UTME COVENANT UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 g sample of a polymer is dissolved in 100 mL of a solvent. If the molar mass of the polymer is 50,000 g/mol, calculate the number of moles of the polymer dissolved.
A. 0.05 mol
B. 0.005 mol
C. 0.5 mol
D. 0.005 mol
Question 2
What is the major product formed when 1-butene reacts with hydrogen in the presence of a palladium catalyst?
A. n-bu\tane
B. 1-butene
C. 2-butene
D. cis-2-butene
Question 3
A 50 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.005
B. 0.01
C. 0.015
D. 0.02
Question 4
A metal M reacts with chlorine gas to form a white solid product. The reaction is represented by the equation: M + Cl2 → MCl2. If 2.5 g of M reacts with 3.2 g of Cl2, what is the mass of the product formed?
A. 5.6 g
B. 6.1 g
C. 6.8 g
D. 7.5 g
Question 5
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is required to reach the equivalence point, calculate the pH of the solution at the equivalence point.
A. 7
B. 10
C. 14
D. 12
Question 6
A 2.0 M solution of a strong acid is diluted to 1.0 M. What is the volume of the solution after dilution?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 7
Determine the pH of a 0.01 M solution of HCl at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 8
A 2.00 g sample of a metal is heated in a crucible to produce a metal oxide. The mass of the metal oxide produced is 2.50 g. What is the percentage increase in mass?
A. 25.0%
B. 50.0%
C. 75.0%
D. 100%
Question 9
A 2.5 M solution of H2SO4 is titrated with 1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 10
Determine the s\tandard potential of the cell represented by the following reaction: Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s). The s\tandard reduction potentials for Zn2+/Zn and Ag+/Ag are -0.76 V and 0.80 V, respectively.
A. -0.04 V
B. 0.04 V
C. 0.76 V
D. 0.80 V
Question 11
A 25 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.0125
B. 0.025
C. 0.0375
D. 0.05
Question 12
A solution contains 0.2 M H2SO4 and 0.2 M NaOH. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 13
What is the expected product of the reaction between ethene and bromine?
A. 1,2-dibromoethane
B. 1,1-dibromoethane
C. 2-bromoethane
D. 2,2-dibromoethane
Question 14
A metal M reacts with oxygen gas to form a brown solid product. The reaction is represented by the equation: 4M + 3O2 → 2M2O3. If 2.5 g of M reacts with 3.2 g of O2, what is the mass of the product formed?
A. 5.6 g
B. 6.1 g
C. 6.8 g
D. 7.5 g
Question 15
Determine the s\tandard Gibbs free energy change (ΔG°) for the reaction: 2Ag+(aq) + 2Cl-(aq) → 2AgCl(s) at 25°C, given that the s\tandard enthalpy change (ΔH°) is -146.0 kJ/mol and the s\tandard entropy change (ΔS°) is -173.0 J/mol·K.
A. -146.0 kJ/mol
B. -146.0 kJ/mol + 173.0 J/mol·K
C. -146.0 kJ/mol - 173.0 J/mol·K
D. -146.0 kJ/mol + 173.0 kJ/mol·K

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