POST UTME UNIPORT 2023 Chemistry | Objective

Are you preparing for POST UTME UNIPORT 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 sodium hydroxide with acetic acid is represented by the equation: CH3COOH + NaOH → CH3COONa + H2O. What is the pH of the solution after the reaction?
Correct A. 7
B. 9
C. 11
D. 13

Correct Answer: A

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Question 2
A 2.5 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat released is 12.5 kJ. What is the molar mass of the hydrocarbon?
A. 50 g/mol
Correct B. 75 g/mol
C. 100 g/mol
D. 125 g/mol

Correct Answer: B

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Question 3
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 2
B. 4
Correct C. 6
D. 8

Correct Answer: C

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Question 4
A diagram of a titration setup is shown below. What is the purpose of the burette in the 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
A 1.0 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat released is 10.0 kJ. What is the molar mass of the hydrocarbon?
A. 50 g/mol
B. 75 g/mol
Correct C. 100 g/mol
D. 125 g/mol

Correct Answer: C

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Question 6
The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. What is the oxidation state of chlorine in the product NaClO?
A. 0
B. +1
C. +2
Correct D. +3

Correct Answer: D

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Question 7
A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 2.0 g, what is the molar mass of the metal carbonate?
A. 100 g/mol
B. 150 g/mol
Correct C. 200 g/mol
D. 250 g/mol

Correct Answer: C

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Question 8
A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the half-reaction that occurs at the anode?
Correct A. 2H2O → O2 + 4H+ + 4e-
B. 2H2O → 2H2 + O2
C. 2NaCl → 2Na+ + 2Cl-
D. 2Na+ + 2Cl- → 2NaCl

Correct Answer: A

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Question 9
A 10 M solution of hydrochloric acid is mixed with a 10 M solution of sodium hydroxide. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 10
A sample of a metal is heated in air to produce a metal oxide. If the mass of the metal oxide produced is 2.5 g, and the mass of the metal used is 2.0 g, what is the percentage yield of the metal oxide?
A. 50%
B. 60%
Correct C. 70%
D. 80%

Correct Answer: C

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