POST UTME AL-HIKMAH UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 3.5 g sample of a metal sulfide is heated to produce a metal oxide and sulfur dioxide gas. The volume of SO2 produced at STP is 2.5 L. What is the mass of the metal oxide produced?
A. 4.2 g
B. 3.8 g
C. 3.5 g
D. 3.2 g
Question 2
A 1.00 M solution of H2SO4(aq) is titrated with a 1.00 M solution of NaOH(aq). If 25.0 mL of NaOH(aq) is required to reach the equivalence point, calculate the number of moles of H2SO4(aq) in 100.0 mL of the solution.
A. 0.00500 mol
B. 0.0100 mol
C. 0.0150 mol
D. 0.0200 mol
Question 3
A sample of a gas at 27°C and 1 atm is compressed to 2 atm at cons\tant temperature. Calculate the new volume of the gas.
A. 0.50
B. 1.00
C. 1.50
D. 2.00
Question 4
A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the resulting pH?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
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 concentration of the solution
C. To measure the pH of the solution
D. To measure the temperature of the solution
Question 6
A 1.00 M solution of H2SO4(aq) is titrated with a 1.00 M solution of NaOH(aq). If 25.0 mL of NaOH(aq) is required to reach the equivalence point, calculate the number of moles of H2SO4(aq) in 100.0 mL of the solution.
A. 0.00500 mol
B. 0.0100 mol
C. 0.0150 mol
D. 0.0200 mol
Question 7
A 2.00 M solution of FeCl3(aq) is electrolyzed u\sing a platinum electrode. If 1.00 C of electricity is passed through the solution, calculate the number of moles of Fe2+(aq) produced.
A. 0.00100 mol
B. 0.00200 mol
C. 0.00300 mol
D. 0.00400 mol
Question 8
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 separate the titrant and analyte
Question 9
A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant pressure. Calculate the ratio of the final volume to the initial volume.
A. 1.25
B. 2.00
C. 3.00
D. 4.00
Question 10
A 1.0 M solution of H2SO4 is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 11
A 2.5 L sample of a gas at 27°C and 1.2 atm is heated to 57°C at cons\tant volume. What is the new pressure in atm?
A. 1.8 atm
B. 2.1 atm
C. 2.5 atm
D. 3.0 atm
Question 12
A 5.0 g sample of a subs\tance is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. What is the molar heat of combustion of the subs\tance?
A. -2500 kJ/mol
B. -3000 kJ/mol
C. -3500 kJ/mol
D. -4000 kJ/mol
Question 13
The atomic number of an element is 15. If the mass number of the most abundant isotope is 31, what is the number of neutrons in the nucleus of this isotope?
A. 16
B. 15
C. 14
D. 17
Question 14
The compound that is formed when nitrogen reacts with oxygen is
A. NO
B. N2O
C. NO2
D. N2O3
Question 15
The solubility of a subs\tance in water can be determined by its
A. Molecular weight
B. Density
C. Boiling point
D. Melting point

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