POST UTME COAL CITY UNIVERSITY 2022 Chemistry | Objective

Are you preparing for POST UTME COAL CITY UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
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
Correct B. 1.2 mol
C. 1.5 mol
D. 2.0 mol

Correct Answer: B

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Question 2
The solubility of a subs\tance in water is 0.5 g/100 mL at 298 K. Calculate the molar solubility of the subs\tance.
Correct A. 0.028 mol/L
B. 0.056 mol/L
C. 0.084 mol/L
D. 0.112 mol/L

Correct Answer: A

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Question 3
A polymer has a molecular weight of 100,000 g/mol. Calculate the number of monomer units in the polymer.
A. 1000
B. 5000
Correct C. 10,000
D. 50,000

Correct Answer: C

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Question 4
A periodic table shows that the atomic number of an element is 20. What is the element?
Correct A. Ca
B. Mg
C. Na
D. K

Correct Answer: A

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Question 5
A solution contains 0.1 M NaCl. Calculate the concentration of Cl- ions in the solution.
Correct A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: A

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Question 6
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 7
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
Correct C. 36.0 g/mol
D. 48.0 g/mol

Correct Answer: C

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Question 8
A 2.5 L flask contains 0.5 M H2SO4. Calculate the number of moles of H2SO4.
A. 0.5 mol
Correct B. 1.0 mol
C. 1.5 mol
D. 2.0 mol

Correct Answer: B

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Question 9
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 10
A 2.5 L flask contains 0.5 M H2SO4. Calculate the number of moles of H2SO4.
A. 0.5 mol
Correct B. 1.0 mol
C. 1.5 mol
D. 2.0 mol

Correct Answer: B

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Question 11
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
Correct B. To accept electrons
C. To facilitate the reaction
D. To slow down the reaction

Correct Answer: B

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Question 12
What is the difference between a primary and secondary bond in a polymer?
A. Primary bonds are stronger than secondary bonds
B. Primary bonds are weaker than secondary bonds
Correct C. Primary bonds are covalent, while secondary bonds are ionic
D. Primary bonds are ionic, while secondary bonds are covalent

Correct Answer: C

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Question 13
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
Correct D. Entropy is a measure of disorder

Correct Answer: D

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Question 14
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
Correct C. pH decreases the rate of a chemical reaction
D. pH has a negligible effect on the rate of a chemical reaction

Correct Answer: C

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Question 15
What is the difference between a natural and synthetic polymer?
A. Natural polymers are biodegradable, while synthetic polymers are not
B. Natural polymers are non-biodegradable, while synthetic polymers are biodegradable
Correct C. Natural polymers are derived from living organisms, while synthetic polymers are not
D. Synthetic polymers are derived from living organisms, while natural polymers are not

Correct Answer: C

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Question 16
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?
Correct A. C6H14
B. C4H10
C. C5H12
D. C3H8

Correct Answer: A

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Question 17
A 0.500 M solution of HCl is titrated with 0.500 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the pH of the solution at the equivalence point?
Correct A. 7
B. 7.5
C. 8
D. 8.5

Correct Answer: A

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Question 18
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
Correct B. 1000
C. 2000
D. 5000

Correct Answer: B

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Question 19
A 1.00-g sample of a biomolecule is dissolved in 100.0 mL of solvent. The solution is then titrated with 0.500 M NaOH, and 20.0 mL of NaOH is required to reach the equivalence point. What is the molar mass of the biomolecule?
A. 200
B. 400
Correct C. 600
D. 800

Correct Answer: C

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Question 20
A 2.00-g sample of a 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?
Correct A. C6H14
B. C4H10
C. C5H12
D. C3H8

Correct Answer: A

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Question 21
The compound formed by the reaction of nitrogen dioxide with water is a(n) _______.
Correct A. nitric acid
B. nitrogen oxide
C. nitrogen gas
D. ozone

Correct Answer: A

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Question 22
The pH of a solution is a measure of its _______.
Correct A. concentration of hydrogen ions
B. concentration of hydroxide ions
C. concentration of oxygen
D. concentration of carbon dioxide

Correct Answer: A

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Question 23
The solubility of a subs\tance is a measure of its _______ in a given solvent.
Correct A. ability to dissolve
B. ability to react
C. ability to absorb
D. ability to conduct electricity

Correct Answer: A

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Question 24
The atomic number of an element is equal to the number of _______ in its atomic nucleus.
Correct A. protons
B. neutrons
C. electrons
D. photons

Correct Answer: A

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Question 25
The bond order of a molecule is a measure of the _______ between its atoms.
Correct A. strength
B. length
C. direction
D. frequency

Correct Answer: A

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