POST UTME OSUSTECH 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50 L container holds 0.500 mol of CO2 at 25°C. What is the partial pressure of CO2 in the container?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 2
A 1.0 L solution of a subs\tance is prepared by dissolving 20 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 1.0 L solution?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 4.0 M
Question 3
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. The initial pH of the solution is 10.0. If 50.0 cm3 of 0.100 M HCl is added to 50.0 cm3 of 0.200 M NaOH, calculate the number of moles of NaCl produced.
A. 0.0050 mol
B. 0.010 mol
C. 0.015 mol
D. 0.020 mol
Question 4
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 2.0 L solution?
A. 1.0 M
B. 2.0 M
C. 4.0 M
D. 8.0 M
Question 5
A 50 mL sample of 0.2 M sodium hydroxide is titrated with 0.2 M hydrochloric acid. Calculate the volume of hydrochloric acid required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 6
A 2.50 L container holds 0.500 mol of O2 at 25°C. What is the partial pressure of O2 in the container?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 7
The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. If 25.0 cm3 of 0.100 M Cl2 is added to 50.0 cm3 of 0.200 M NaOH, calculate the number of moles of NaClO produced.
A. 0.0050 mol
B. 0.010 mol
C. 0.015 mol
D. 0.020 mol
Question 8
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. The initial pH of the solution is 10.0. If 25.0 cm3 of 0.100 M HCl is added to 50.0 cm3 of 0.200 M NaOH, calculate the final pH of the solution.
A. 9.00
B. 9.50
C. 10.0
D. 10.5
Question 9
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. Sodium hydroxide
B. Hydrochloric acid
C. Sulfuric acid
D. Nitric acid
Question 10
A 2.50 g sample of a metal oxide is found to contain 1.50 g of oxygen. What is the percentage composition of the oxide?
A. 60.0%
B. 50.0%
C. 40.0%
D. 30.0%
Question 11
A 1.0 L solution of a subs\tance is prepared by dissolving 20 g of the subs\tance in 1.0 L of water. What is the molar solubility of the subs\tance?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 4.0 M
Question 12
A solution contains 0.500 g of KCl per 100 mL. What is the molarity of the solution?
A. 0.500 M
B. 1.00 M
C. 2.00 M
D. 5.00 M
Question 13
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the molar mass of the subs\tance?
A. 80 g/mol
B. 120 g/mol
C. 160 g/mol
D. 200 g/mol
Question 14
The diagram below shows a titration setup. What is the purpose of the burette?
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 prevent the mixing of the titrant and analyte.
Question 15
The solubility of a subs\tance in water is measured by its molar solubility (S) in moles per liter. If the solubility of a subs\tance is 0.5 M at 25°C, what is the concentration of the subs\tance in a 2.0 L solution?
A. 1.0 M
B. 0.5 M
C. 0.25 M
D. 0.125 M

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