POST UTME EKSU 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a non-metallic oxide is found to have a mass of 25.0 g and a volume of 2.5 L. Calculate the molar mass of the oxide.
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 2
A sample of a metal is found to have a mass of 50.0 g and a volume of 5.0 L. Calculate the molar mass of the metal.
A. 10 g/mol
B. 20 g/mol
C. 30 g/mol
D. 40 g/mol
Question 3
A 1.00 M solution of H2SO4 is mixed with a 1.00 M solution of NaOH. What is the resulting concentration of H2SO4?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 4
A 10 mL sample of 0.5 M HCl is mixed with 10 mL of 0.5 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 5
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 6
A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. What is the resulting concentration of HCl?
A. 0.250 M
B. 0.375 M
C. 0.500 M
D. 0.625 M
Question 7
Determine the molar solubility of CaF2 in a 0.1 M NaF solution, given that the solubility product cons\tant (Ksp) for CaF2 is 3.9 × 10^-11.
A. 1.0 × 10^-3 M
B. 1.0 × 10^-4 M
C. 1.0 × 10^-5 M
D. 1.0 × 10^-6 M
Question 8
A 1.00-L solution of 0.100 M NaCl is mixed with a 1.00-L solution of 0.100 M CaCl2. What is the concentration of Cl- ions in the resulting solution?
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 9
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 10
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.025
B. 0.05
C. 0.075
D. 0.1
Question 11
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 1 L
B. 2 L
C. 4 L
D. 8 L
Question 12
A 2.50 g sample of a hydrocarbon is combusted in a bomb calorimeter, relea\sing 12.5 kJ of heat energy. If the molar mass of the hydrocarbon is 140 g/mol, what is the average bond energy of the C-H bonds in the hydrocarbon?
A. 350 kJ/mol
B. 400 kJ/mol
C. 450 kJ/mol
D. 500 kJ/mol
Question 13
A 25.0-mL sample of a 0.100 M solution of NaOH is added to a 100.0-mL sample of a 0.100 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
A 2.50-g sample of a compound containing only carbon and hydrogen is burned in a combustion calorimeter, producing 2.00 L of CO2 and 1.50 L of H2O at 25°C and 1 atm. Calculate the empirical formula of the compound.
A. CH4
B. C2H6
C. C3H8
D. C4H10
Question 15
Determine the solubility of CaF2 in a 0.1 M NaCl solution at 25°C, given that the solubility product cons\tant (Ksp) for CaF2 is 3.9 × 10^-11.
A. 1.0 × 10^-5 M
B. 1.5 × 10^-5 M
C. 2.0 × 10^-5 M
D. 2.5 × 10^-5 M

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