POST UTME NILE UNIVERSITY 2022 Chemistry | Objective

Are you preparing for POST UTME NILE 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 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in 4 L of water. What is the molarity of the solution?
Correct A. 2.5 M
B. 1.25 M
C. 0.5 M
D. 5 M

Correct Answer: A

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Question 2
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -110 kJ/mol. What is the equilibrium cons\tant (K) for this reaction?
Correct A. 1.0 x 10^10
B. 1.0 x 10^5
C. 1.0 x 10^2
D. 1.0 x 10^-5

Correct Answer: A

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Question 3
A sample of CO2 gas at 25°C and 1 atm is collected over water in a flask. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of CO2?
Correct A. 0.977 atm
B. 0.923 atm
C. 0.869 atm
D. 0.815 atm

Correct Answer: A

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Question 4
A 0.100 M solution of FeCl3 is prepared by dissolving 3.0 g of FeCl3 in 1 L of water. What is the concentration of Fe3+ ions in the solution?
Correct A. 0.033 M
B. 0.100 M
C. 0.167 M
D. 0.250 M

Correct Answer: A

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Question 5
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
Correct A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte

Correct Answer: A

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Question 6
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. Which of the following is the major product?
A. 1,2-dibromocyclohexane
Correct B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,2-dibromocyclohexane

Correct Answer: B

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Question 7
The element with atomic number 36 is
Correct A. Krypton
B. Strontium
C. Barium
D. Caesium

Correct Answer: A

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Question 8
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the unit of solubility?
A. g/L
Correct B. mol/L
C. g/mol
D. L/mol

Correct Answer: B

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Question 9
The reaction of sulfur with oxygen produces sulfur dioxide. The balanced equation for this reaction is
Correct A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5

Correct Answer: A

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Question 10
The element with atomic number 10 is
A. Neon
Correct B. Argon
C. Krypton
D. Xenon

Correct Answer: B

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Question 11
Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess O2 according to the equation: C6H12O6 + 6O2 → 6CO2 + 6H2O. The molar mass of C6H12O6 is 180 g/mol.
A. 0.025 mol
Correct B. 0.05 mol
C. 0.1 mol
D. 0.15 mol

Correct Answer: B

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Question 12
A 2.5 M solution of HCl is mixed with a 2.5 M solution of NaOH in a 1:1 mole ratio. What is the resulting concentration of the solution after the reaction is complete?
A. 2.5 M
Correct B. 1.25 M
C. 0.5 M
D. 0 M

Correct Answer: B

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Question 13
A sample of 1.0 g of a subs\tance is found to have a mass of 1.5 g after being dried in an oven at 120°C. What is the percentage of water in the original sample?
A. 10%
Correct B. 20%
C. 30%
D. 40%

Correct Answer: B

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Question 14
A reaction is represented by the equation: 2A + B → 2C + D. If 2.0 g of A and 1.5 g of B are mixed and allowed to react, what is the limiting reac\tant?
A. A
Correct B. B
C. C
D. D

Correct Answer: B

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Question 15
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of Ba(OH)2 in a 1:1 mole ratio. What is the resulting concentration of the solution after the reaction is complete?
A. 1.0 M
Correct B. 0.5 M
C. 0.25 M
D. 0 M

Correct Answer: B

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Question 16
A 0.5 M solution of a weak acid, HA, is titrated with 0.5 M NaOH. If the initial pH of the solution is 3.5, what is the pH after the addition of 20 mL of NaOH?
A. 4.5
B. 5.5
Correct C. 6.5
D. 7.5

Correct Answer: C

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Question 17
A mixture of 2.0 g of glu\cose (C6H12O6) and 3.0 g of fructose (C6H12O6) is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 18
A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. If the pressure of the gas is 1.0 atm, what is the volume of the flask?
Correct A. 2.0 L
B. 2.5 L
C. 3.0 L
D. 3.5 L

Correct Answer: A

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Question 19
A polymer 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
Correct B. 200 g/mol
C. 300 g/mol
D. 400 g/mol

Correct Answer: B

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Question 20
A 1.0 L flask contains 0.5 mol of a gas at a temperature of 400 K. If the pressure of the gas is 2.0 atm, what is the volume of the flask?
A. 1.0 L
B. 1.5 L
Correct C. 2.0 L
D. 2.5 L

Correct Answer: C

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Question 21
A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. If the pressure of the gas is 1.0 atm, what is the volume of the flask?
Correct A. 2.0 L
B. 2.5 L
C. 3.0 L
D. 3.5 L

Correct Answer: A

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Question 22
A 1.0 L flask contains 0.5 mol of a gas at a temperature of 400 K. If the pressure of the gas is 2.0 atm, what is the volume of the flask?
A. 1.0 L
B. 1.5 L
Correct C. 2.0 L
D. 2.5 L

Correct Answer: C

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Question 23
A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. If the pressure of the gas is 1.0 atm, what is the volume of the flask?
Correct A. 2.0 L
B. 2.5 L
C. 3.0 L
D. 3.5 L

Correct Answer: A

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Question 24
A 1.0 L flask contains 0.5 mol of a gas at a temperature of 400 K. If the pressure of the gas is 2.0 atm, what is the volume of the flask?
A. 1.0 L
B. 1.5 L
Correct C. 2.0 L
D. 2.5 L

Correct Answer: C

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Question 25
Determine the pH of a 0.1 M solution of HCl.
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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