POST UTME UNIOSUN 2023 Chemistry | Objective

Are you preparing for POST UTME UNIOSUN 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
Determine the major product of the reaction between 2-methylpropene and HCl.
Correct A. 1-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
C. 1-chloro-2-methylbu\tane
D. 2-chloro-2-methylbu\tane

Correct Answer: A

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Question 2
Calculate the molarity of a solution containing 25.0 g of NaCl in 250 mL of water.
Correct A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M

Correct Answer: A

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Question 3
Identify the type of reaction represented by the equation: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g).
A. Synthesis reaction
B. Decomposition reaction
Correct C. Single displacement reaction
D. Double displacement reaction

Correct Answer: C

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Question 4
A 25.0 mL sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl in the sample.
A. 0.0025 mol
Correct B. 0.0050 mol
C. 0.0075 mol
D. 0.0100 mol

Correct Answer: B

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Question 5
A 50.0 mL sample of a solution containing 0.0500 M K2Cr2O7 is treated with 10.0 mL of 1.00 M H2SO4. Calculate the concentration of Cr3+ ions in the solution.
A. 0.0025 M
Correct B. 0.0050 M
C. 0.0075 M
D. 0.0100 M

Correct Answer: B

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Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following reaction: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1782 kJ/mol
B. -1785 kJ/mol
C. -1788 kJ/mol
D. -1790 kJ/mol

Correct Answer: A

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Question 7
A 2.50 g sample of a metal is electrolyzed u\sing a current of 2.00 A for 3.00 h. If the metal has a s\tandard reduction potential of -0.80 V, what is the mass of the metal deposited?
A. 0.500 g
B. 0.750 g
Correct C. 1.00 g
D. 1.25 g

Correct Answer: C

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Question 8
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6(s).
A. -2800 kJ/mol
Correct B. -2850 kJ/mol
C. -2900 kJ/mol
D. -2950 kJ/mol

Correct Answer: B

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Question 9
A 1.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
Correct B. 8.00
C. 9.00
D. 10.0

Correct Answer: B

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Question 10
A 2.00 g sample of a metal is electrolyzed u\sing a current of 2.00 A for 3.00 h. If the metal has a s\tandard reduction potential of -0.80 V, what is the mass of the metal deposited?
A. 0.500 g
B. 0.750 g
Correct C. 1.00 g
D. 1.25 g

Correct Answer: C

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