POST UTME UNIOSUN 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 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
B. 2
C. 3
D. 4
Question 2
A sample of a metal is heated in a crucible and reacts with oxygen to form a compound. The reaction is represented by the equation: 2M + O2 → 2MO. If 2.5 g of the metal is heated, what is the mass of oxygen required?
A. 1.0 g
B. 1.5 g
C. 2.0 g
D. 2.5 g
Question 3
A solution of 0.1 M NaCl is prepared by dissolving 5.0 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.5 g/L
B. 1 g/L
C. 2 g/L
D. 5 g/L
Question 4
A 10.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 7.00, what is the volume of NaOH added?
A. 10.0 mL
B. 20.0 mL
C. 30.0 mL
D. 40.0 mL
Question 5
A 2.5 L flask contains 0.15 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.1 atm
B. 1.2 atm
C. 1.3 atm
D. 1.4 atm
Question 6
A 2.0 L flask contains a mixture of 1.0 M HCl and 0.5 M NaOH. What is the concentration of the resulting solution?
A. 0.5 M
B. 1 M
C. 1.5 M
D. 2 M
Question 7
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To inhibit the reaction
Question 8
A 10 M solution of HCl is mixed with a 10 M solution of NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 9
The reaction of polyethylene with oxygen in the presence of a catalyst is an example of a
A. combustion reaction
B. oxidation reaction
C. polymerization reaction
D. degradation reaction
Question 10
A sample of a gas has a volume of 2.5 L at a pressure of 1.5 atm. If the pressure is increased to 3.0 atm, what is the new volume of the gas?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 11
A sample of hydrogen gas is collected over water at 25°C and 1 atm. What is the partial pressure of hydrogen gas?
A. 1 atm
B. 0.5 atm
C. 0.75 atm
D. 1.25 atm
Question 12
A 2.0 L flask contains 0.50 mol of CO2 at 25°C. Calculate the partial pressure of CO2 u\sing the ideal gas law.
A. 1.1 atm
B. 1.2 atm
C. 1.3 atm
D. 1.4 atm
Question 13
The rate cons\tant of a reaction is 1.5 s-1. If the initial concentration of the reac\tant is 0.5 M, what is the concentration after 2 minutes?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M
Question 14
A 2.0 g sample of a polymer is dissolved in 100 mL of tetrahydrofuran (THF). If the vis\cosity of the solution is 1.5 times that of the solvent, what is the molecular weight of the polymer?
A. 1000 g/mol
B. 5000 g/mol
C. 10000 g/mol
D. 20000 g/mol
Question 15
A 10 mL sample of a solution containing 0.1 M CuSO4 is electrolyzed u\sing a current of 2 A for 5 minutes. What is the mass of copper deposited at the cathode?
A. 0.1 g
B. 0.2 g
C. 0.3 g
D. 0.4 g

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