POST UTME UNIPORT 2023 Chemistry | Objective

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?
A. 7
B. 9
C. 11
D. 13
Question 2
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
D. +3
Question 3
A diagram of a titration setup is shown below. What is the purpose of the burette in the setup?
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
Question 4
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
C. 6
D. 8
Question 5
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
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 6
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
C. 100 g/mol
D. 125 g/mol
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
C. 200 g/mol
D. 250 g/mol
Question 8
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%
C. 70%
D. 80%
Question 9
A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the half-reaction that occurs at the anode?
A. 2H2O → O2 + 4H+ + 4e-
B. 2H2O → 2H2 + O2
C. 2NaCl → 2Na+ + 2Cl-
D. 2Na+ + 2Cl- → 2NaCl
Question 10
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
D. 4

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