POST UTME UNN 2023 Chemistry | Objective

Prepare for your exams with POST UTME UNN questions? Reviewing past/model 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.

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

Correct Answer: D

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Question 2 View Details
What is the oxidation state of the underlined atom in the compound H2SO4?
A. +2
B. +4
Correct C. +6
D. +8

Correct Answer: C

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Question 3 View Details
A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. The resulting solution has a conductivity of 0.02 S/m. What is the molar conductivity of the solution?
A. 10
Correct B. 20
C. 30
D. 40

Correct Answer: B

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Question 4 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 5 View Details
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 6 View Details
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). Given that ΔH°(Al2O3(s)) = -1675 kJ/mol, ΔH°(Al(s)) = 0 kJ/mol, ΔH°(Fe2O3(s)) = -825 kJ/mol, and ΔH°(Fe(s)) = 0 kJ/mol.
Correct A. -2750 kJ/mol
B. -1750 kJ/mol
C. -275 kJ/mol
D. -175 kJ/mol

Correct Answer: A

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Question 7 View Details
A solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 8 View Details
The s\tandard Gibbs free energy change for the reaction: 2NO(g) + O2(g) → 2NO2(g) is -120 kJ/mol. Calculate the equilibrium cons\tant (K) for the reaction.
A. 10^\( -6 \)
B. 10^\( -3 \)
Correct C. 10^\( -2 \)
D. 10^\( -1 \)

Correct Answer: C

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Question 9 View Details
A 2.5 M solution of H2SO4 is titrated with 1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 10 View Details
The s\tandard enthalpy change for the reaction: CaO(s) + H2O(l) → Ca(OH)2(s) is -63.5 kJ/mol. Calculate the s\tandard entropy change (ΔS°) for the reaction.
Correct A. -0.1 kJ/mol·K
B. -0.2 kJ/mol·K
C. -0.3 kJ/mol·K
D. -0.4 kJ/mol·K

Correct Answer: A

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