POST UTME ESUT 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M NaCl and 0.1 M NaOH. What is the pH of the solution?
A. 7
B. 8
C. 9
D. 10
Question 2
A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.8 g, calculate the molar mass of the metal.
A. 40.0 g/mol
B. 50.0 g/mol
C. 60.0 g/mol
D. 70.0 g/mol
Question 3
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, 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 4
A 2.00 g sample of an unknown hydrocarbon is burned in a combustion calorimeter. The heat of combustion is 12.5 kJ/g. Calculate the molar mass of the hydrocarbon.
A. 50.0 g/mol
B. 75.0 g/mol
C. 100 g/mol
D. 125 g/mol
Question 5
A solution of 0.01 M HCl is prepared by dissolving 0.01 mol of HCl in 1 L of water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 6
A 1 L solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 7
B. 8
C. 9
D. 10
Question 7
A solution containing 5.0 g of NaCl is prepared by dissolving the salt in 100 mL of water. Calculate the molarity of the solution.
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 8
A 10.0-g sample of a metal is heated in a crucible until it decomposes completely. The mass of the metal obtained is 5.0 g. Calculate the percentage yield of the metal if the theoretical yield is 6.0 g.
A. 83%
B. 85%
C. 87%
D. 90%
Question 9
In a reaction where 2.5 g of a non-metallic oxide (M2O3) reacts with 1.5 g of carbon to produce 1.8 g of M2C, calculate the molar mass of M2C.
A. 120 g/mol
B. 180 g/mol
C. 240 g/mol
D. 300 g/mol
Question 10
The diagram below shows a titration setup.
A. The burette contains the titrant.
B. The beaker contains the analyte.
C. The burette contains the analyte.
D. The beaker contains the titrant.
Question 11
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. 2.50
D. 3.00
Question 12
A 2.50-g sample of a metal oxide is heated in a crucible until it decomposes completely. The mass of the metal obtained is 1.25 g. Calculate the percentage yield of the metal if the theoretical yield is 1.50 g.
A. 75%
B. 80%
C. 85%
D. 90%
Question 13
A gas at 27°C and 1 atm is compressed to 4 atm. If the initial volume is 2.5 L, what is the final volume of the gas?
A. 1.25 L
B. 2.5 L
C. 5.0 L
D. 10.0 L
Question 14
A gas at 37°C and 2 atm is expanded to 1 atm. If the initial volume is 3.0 L, what is the final volume of the gas?
A. 1.5 L
B. 3.0 L
C. 4.5 L
D. 6.0 L
Question 15
A solution of 0.1 M NaCl is prepared by dissolving 0.1 mol of NaCl in 1 L of water. What is the concentration of Na+ ions in the solution?
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M

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