POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. Calculate the number of moles of HCl that have reacted after 25 mL of NaOH has been added.
A. 0.005 mol
B. 0.010 mol
C. 0.015 mol
D. 0.020 mol
Question 2
The entropy change of a system is
A. a measure of the disorder of the system
B. a measure of the energy of the system
C. a measure of the temperature of the system
D. a measure of the pressure of the system
Question 3
The solubility of a subs\tance in a solvent is influenced by the
A. temperature of the solvent
B. pressure of the solvent
C. concentration of the solute
D. pH of the solvent
Question 4
A 2.50 M solution of sodium chloride is prepared by dissolving 75.0 g of sodium chloride in 250.0 mL of water. What is the molarity of the solution?
A. 0.30 M
B. 0.50 M
C. 0.75 M
D. 1.00 M
Question 5
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the pH of the solution
C. To measure the concentration of the solution
D. To measure the temperature of the solution
Question 6
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas, assuming it behaves ideally?
A. 1.0 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 7
A solution contains 0.1 M NH3 and 0.1 M NH4Cl. What is the pH of the solution?
A. 9.25
B. 9.75
C. 10.25
D. 10.75
Question 8
A solution contains 0.50 M NaCl. What is the concentration of Cl- ions?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M
Question 9
A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas, assuming it behaves ideally?
A. 1.0 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 10
A sample of air contains 21% O2, 78% N2, and 1% other gases. Calculate the partial pressure of O2 at a total pressure of 101.3 kPa.
A. 21.3 kPa
B. 21.7 kPa
C. 22.1 kPa
D. 22.5 kPa
Question 11
The compound that is formed when nitrogen reacts with oxygen is
A. nitric oxide (NO)
B. nitrogen dioxide (NO2)
C. nitrogen trioxide (N2O3)
D. nitrogen tetroxide (N2O4)
Question 12
A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added. Given that the pKa of HCl is 7.0.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 13
A diagram of a chemical apparatus is shown below. What is the purpose of the test tube?
A. To mix the reac\tants
B. To heat the reac\tants
C. To measure the volume of the solution
D. To measure the pH of the solution
Question 14
The half-life of a radioactive subs\tance is 5.0 years. If 100 g of the subs\tance initially contains 50 g of the radioactive isotope, how much of the isotope will remain after 10 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 15
A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?
A. 0.5
B. 1.0
C. 2.0
D. 3.0

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