POST UTME AFE BABALOLA UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a gas at 25°C and 1 atm has a volume of 2.00 L. What is the new volume of the gas if it is compressed to 4 atm?
A. 0.50 L
B. 1.00 L
C. 2.00 L
D. 4.00 L
Question 2
A gas at 25°C and 1 atm is compressed to 4 atm. What is the new volume of the gas?
A. 0.25 L
B. 0.50 L
C. 1.00 L
D. 2.00 L
Question 3
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 1.0 L of water. Calculate the concentration of Cl- ions in the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
A 2.5 M solution of HCl is prepared by dissolving 25 g of HCl in water to make 1 L of solution. What is the pH of the solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 5
A solution contains 0.50 M HCl and 0.50 M NaOH. What is the pH of the solution after mixing 50.0 mL of each?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 6
A solution of 2.0 g of glu\cose in 100 g of water has a boiling point elevation of 0.50°C. What is the molar mass of glu\cose?
A. 180 g/mol
B. 200 g/mol
C. 220 g/mol
D. 240 g/mol
Question 7
A polymer is formed by the condensation reaction between two monomers. If the molecular weight of the monomer is 100 g/mol, and the molecular weight of the polymer is 200 g/mol, what is the degree of polymerization?
A. 1
B. 2
C. 3
D. 4
Question 8
A metal (M) reacts with oxygen to form a basic oxide. The metal has a s\tandard electrode potential of +0.5 V. Calculate the s\tandard Gibbs free energy change for the reaction.
A. -100 kJ/mol
B. -200 kJ/mol
C. -300 kJ/mol
D. -400 kJ/mol
Question 9
A 25.0 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 10 mL
B. 20 mL
C. 25 mL
D. 30 mL
Question 10
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. Calculate the ratio of the final pressure to the initial pressure.
A. 1.33
B. 1.5
C. 2.0
D. 3.0
Question 11
The reaction between nitrogen and oxygen to form nitrogen dioxide is represented by the equation: \text{N}_2 + \text{O}_2 \rightarrow \text{NO}_2. What is the oxidation state of nitrogen in the product?
A. -2
B. +2
C. +4
D. +6
Question 12
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 measure the pH of the solution
Question 13
The diagram below shows a setup for electrolysis of water.
A. The anode is the cathode
B. The cathode is the anode
C. The anode is the left electrode
D. The cathode is the right electrode
Question 14
A 2.00 g sample of a metal (M) is heated in a crucible until it melts. The temperature of the metal is raised to 1500°C. Calculate the energy required to melt the metal.
A. 100 kJ
B. 200 kJ
C. 300 kJ
D. 400 kJ
Question 15
A 10.0 g sample of sulfur is burned in oxygen to produce sulfur dioxide. If the reaction is 100% efficient, what is the volume of oxygen required in liters at STP?
A. 2.0 L
B. 4.0 L
C. 6.0 L
D. 8.0 L

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