POST UTME COAL CITY UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To slow down the reaction
Question 2
What is the effect of pH on the rate of a chemical reaction?
A. pH has no effect on the rate of a chemical reaction
B. pH increases the rate of a chemical reaction
C. pH decreases the rate of a chemical reaction
D. pH has a negligible effect on the rate of a chemical reaction
Question 3
A sample of an unknown organic compound has a molecular formula of C4H8O2. What is the most likely functional group present in this compound?
A. Aldehyde
B. Ketone
C. Ester
D. Carboxylic acid
Question 4
A solution of 0.100 M NaOH is titrated with 0.100 M HCl. What is the concentration of the resulting solution after the reaction is complete?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 5
A metal (M) reacts with chlorine gas (Cl2) to form a metal chloride (MCl2). If the reaction is: 2M + Cl2 → 2MCl, what is the oxidation state of the metal (M) in the product?
A. +1
B. +2
C. +3
D. +4
Question 6
A 2.00-g sample of a polymer is dissolved in 100.0 mL of solvent. The solution is then titrated with 0.500 M NaOH, and 25.0 mL of NaOH is required to reach the equivalence point. What is the molar mass of the polymer?
A. 500
B. 1000
C. 2000
D. 5000
Question 7
What is the relationship between entropy and the second law of thermodynamics?
A. Entropy increases with temperature
B. Entropy decreases with temperature
C. Entropy is cons\tant at equilibrium
D. Entropy is a measure of disorder
Question 8
The bond order of a molecule is a measure of the _______ between its atoms.
A. strength
B. length
C. direction
D. frequency
Question 9
A 2.50-g sample of an unknown hydrocarbon is burned in a combustion calorimeter. The reaction is carried out in a bomb calorimeter, and the heat of combustion is found to be - 35.5 kJ/g. If the unknown hydrocarbon has a molar mass of 84.2 g/mol, what is its empirical formula?
A. C6H14
B. C4H10
C. C5H12
D. C3H8
Question 10
Calculate the molar mass of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.
A. 12.0 g/mol
B. 24.0 g/mol
C. 36.0 g/mol
D. 48.0 g/mol
Question 11
A solution contains 0.1 M NaCl. Calculate the concentration of Cl- ions in the solution.
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 12
A 2.5 L flask contains 0.5 M H2SO4. Calculate the number of moles of H2SO4.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 13
A mixture of 0.5 mol of CO2 and 0.3 mol of H2O is heated to 373 K. Calculate the total number of moles of gas present in the mixture.
A. 0.8 mol
B. 1.2 mol
C. 1.5 mol
D. 2.0 mol
Question 14
The solubility of a subs\tance is a measure of its _______ in a given solvent.
A. ability to dissolve
B. ability to react
C. ability to absorb
D. ability to conduct electricity
Question 15
A 2.5 L flask contains 0.5 M H2SO4. Calculate the number of moles of H2SO4.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol

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