POST UTME AFE BABALOLA UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a redox reaction setup. If 25.0 cm3 of 0.100 M Fe2+ is required to reduce 20.0 cm3 of MnO4-, what is the concentration of the MnO4- solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 2
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The metal oxide is then reduced with hydrogen gas to produce the pure metal. If 1.75 g of the metal oxide is obtained, calculate the percentage yield of the metal.
A. 60%
B. 65%
C. 70%
D. 75%
Question 3
A sample of a metal (M) has a mass of 25.0 g and a volume of 5.00 cm3. If the density of the metal is 8.00 g/cm3, what is the molar mass of the metal?
A. 40.0 g/mol
B. 80.0 g/mol
C. 120 g/mol
D. 160 g/mol
Question 4
A 2.00 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The metal oxide is then reduced with hydrogen gas to produce the pure metal. If 1.75 g of the metal oxide is obtained, calculate the percentage yield of the metal.
A. 60%
B. 65%
C. 70%
D. 75%
Question 5
The diagram below shows a titration setup. If 25.0 cm3 of 0.100 M NaOH is required to neutralize 20.0 cm3 of HCl, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 6
A 2.50 g sample of a non-metallic element (X) is found to have a mass of 2.50 g and a volume of 5.00 cm3. If the density of the element is 5.00 g/cm3, what is the molar mass of the element?
A. 10.0 g/mol
B. 20.0 g/mol
C. 30.0 g/mol
D. 40.0 g/mol
Question 7
A 2.00 L container holds 0.500 mol of an ideal gas at a temperature of 298 K. If the gas is allowed to expand to a volume of 4.00 L at cons\tant temperature, what is the new pressure of the gas?
A. 0.125 atm
B. 0.250 atm
C. 0.500 atm
D. 1.00 atm
Question 8
Determine the number of moles of oxygen gas (O2) required to react completely with 2.50 moles of propane (C3H8) according to the balanced equation: 2C3H8 + 19O2 → 12CO2 + 14H2O.
A. 0.25 mol
B. 0.50 mol
C. 1.00 mol
D. 1.25 mol
Question 9
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. If 50.0 mL of the HCl solution is added to 50.0 mL of the NaOH solution, what is the concentration of the resulting solution?
A. 0.500 M
B. 1.00 M
C. 1.50 M
D. 2.00 M
Question 10
A solution containing 0.050 M NaOH is mixed with a solution containing 0.050 M HCl. If 50.0 mL of the NaOH solution is added to 50.0 mL of the HCl solution, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

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