POST UTME AFE BABALOLA UNIVERSITY 2023 Chemistry | Objective

Are you preparing for POST UTME AFE BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

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

Correct Answer: B

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Question 2
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -22.4 kJ/mol. What is the equilibrium cons\tant (K) for this reaction?
A. 1.0 x 10^\( -5 \)
B. 1.0 x 10^\( -3 \)
Correct C. 1.0 x 10^\( -2 \)
D. 1.0 x 10^\( -1 \)

Correct Answer: C

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Question 3
A 2.50 L flask contains 0.250 mol of N2 gas at 25°C. What is the pressure of the gas in the flask?
A. 0.500 atm
B. 0.750 atm
Correct C. 1.00 atm
D. 1.25 atm

Correct Answer: C

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Question 4
The diagram below shows a titration setup. 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 5
The reaction of ethanol with hydrogen in the presence of a catalyst produces ethane. What is the balanced equation for this reaction?
Correct A. \( C_2H_5OH + H_2 \rightarrow C_2H_6 + H_2O \)
B. \( C_2H_5OH + H_2O \rightarrow C_2H_6 + H_2 \)
C. \( C_2H_5OH + O_2 \rightarrow C_2H_6 + H_2O \)
D. \( C_2H_5OH + H_2 \rightarrow C_2H_6 + CO_2 \)

Correct Answer: A

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Question 6
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 g of potassium chlorate (KClO3) is decomposed according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 0.06 mol
Correct B. 0.08 mol
C. 0.10 mol
D. 0.12 mol

Correct Answer: B

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Question 7
A 0.500 M solution of sodium hydroxide (NaOH) is mixed with a 0.750 M solution of hydrochloric acid (HCl). Calculate the pH of the resulting solution.
A. 2.00
B. 2.50
Correct C. 3.00
D. 3.50

Correct Answer: C

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Question 8
The diagram below shows a titration setup. What is the purpose of the burette?
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 9
A sample of hydrogen gas (H2) is collected over water at 25°C and 1 atm. The volume of the gas is 2.50 L. Calculate the number of moles of hydrogen gas collected.
A. 0.010 mol
Correct B. 0.020 mol
C. 0.030 mol
D. 0.040 mol

Correct Answer: B

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Question 10
The diagram below shows a circuit with a battery, a resistor, and a light bulb. What is the purpose of the resistor?
Correct A. To reduce the current flowing through the circuit
B. To increase the voltage of the battery
C. To decrease the resis\tance of the circuit
D. To increase the brightness of the light bulb

Correct Answer: A

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Question 11
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
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 12
A 2.50 L flask contains 0.150 mol of an ideal gas at 298 K. What is the pressure of the gas?
A. 1.01 x 10^2 Pa
Correct B. 1.01 x 10^3 Pa
C. 1.01 x 10^4 Pa
D. 1.01 x 10^5 Pa

Correct Answer: B

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Question 13
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
Correct A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol

Correct Answer: A

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Question 14
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
Correct A. 7.00
B. 7.00
C. 7.00
D. 7.00

Correct Answer: A

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Question 15
The diagram below shows a titration setup. What is the purpose of the burette?
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 measure the pH of the solution

Correct Answer: A

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Question 16
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a weak base B. The resulting solution is a buffer with a pH of 4.5. If 10 mL of 1 M HCl is added to the buffer, what is the new pH?
A. 3.5
Correct B. 4.5
C. 5.5
D. 6.5

Correct Answer: B

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Question 17
A polymer has a molecular weight of 100,000 g/mol. If 10 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
Correct A. 100 g/L
B. 200 g/L
C. 500 g/L
D. 1000 g/L

Correct Answer: A

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Question 18
A 1 M solution of a non-electrolyte solute is mixed with a 1 M solution of a strong electrolyte solute. The resulting solution is a solution with a colligative property of 10. What is the molality of the solution?
A. 0.1 m
B. 0.5 m
Correct C. 1.0 m
D. 5.0 m

Correct Answer: C

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Question 19
A 1 L solution of a gas at 25°C and 1 atm is compressed to 10 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.1 L
B. 0.5 L
C. 1.0 L
Correct D. 5.0 L

Correct Answer: D

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Question 20
A 1 M solution of a weak acid HA is mixed with a 1 M solution of a strong base B. The resulting solution is a solution with a pH of 7. If 10 mL of 1 M HCl is added to the solution, what is the new pH?
A. 6.5
Correct B. 7.5
C. 8.5
D. 9.5

Correct Answer: B

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