POST UTME UI 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The solubility product cons\tant (Ksp) of AgCl is 1.8 x 10^-10. Calculate the molar solubility of AgCl.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M
Question 2
A 2.5 g sample of a non-metallic oxide is heated in a stream of CO2 gas. The mass of the oxide decreases by 1.5 g. What is the empirical formula of the oxide?
A. CO
B. CO2
C. C2O
D. C3O2
Question 3
A solution of a weak acid is prepared by dissolving 25 g of the acid in 100 mL of water. What is the concentration of the acid in the solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 4
Determine the oxidation state of sulfur in the compound H2SO4.
A. +2
B. +4
C. +6
D. +8
Question 5
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the polymer in the solution?
A. 1 g/L
B. 10 g/L
C. 100 g/L
D. 1000 g/L
Question 6
The reaction of a hydrocarbon with chlorine gas produces a dichloroalkane. If the molecular weight of the hydrocarbon is 120 g/mol and the molecular weight of the dichloroalkane is 200 g/mol, what is the molecular weight of the chlorine gas used?
A. 80 g/mol
B. 90 g/mol
C. 100 g/mol
D. 110 g/mol
Question 7
A solution of a weak acid is prepared by dissolving 25 g of the acid in 100 mL of water. What is the concentration of the acid in the solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 8
A mixture of 50 mL of 0.5 M HCl and 50 mL of 0.5 M NaOH is titrated with 1 M HCl. What is the volume of HCl required to reach the equivalence point?
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 9
A 1 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1 L of water. What is the concentration of OH- ions in the solution?
A. 1 M
B. 0.5 M
C. 0.25 M
D. 0.1 M
Question 10
The following diagram shows a setup for the extraction of a metal from its ore. What is the purpose of the electrolyte in the cell?
A. To conduct electricity
B. To purify the metal
C. To increase the temperature
D. To decrease the pressure
Question 11
The reaction of zinc metal with copper(II) sulfate solution is a classic example of a redox reaction. Write the balanced equation for this reaction, including the state of each subs\tance.
A. Zn + CuSO4 → ZnSO4 + Cu
B. Zn + CuSO4 → ZnSO4 + Cu2O
C. Zn + CuSO4 → ZnSO4 + CuSO3
D. Zn + CuSO4 → ZnSO4 + Cu(OH)2
Question 12
A 2 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1 L of water. What is the concentration of H+ ions in the solution?
A. 2 M
B. 1 M
C. 0.5 M
D. 0.25 M
Question 13
A 0.5 M solution of H2SO4 is prepared by dissolving 28 g of H2SO4 in 1 L of water. What is the concentration of H+ ions in the solution?
A. 0.5 M
B. 0.25 M
C. 0.1 M
D. 0.05 M
Question 14
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
D. 4
Question 15
The reaction of a hydrocarbon with chlorine gas produces a dichloroalkane. If the molecular weight of the hydrocarbon is 120 g/mol and the molecular weight of the dichloroalkane is 200 g/mol, what is the molecular weight of the chlorine gas used?
A. 80 g/mol
B. 90 g/mol
C. 100 g/mol
D. 110 g/mol

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