POST UTME ESUT 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1.00 L of water. What is the pH of the solution?
A. 13.0
B. 13.5
C. 14.0
D. 14.5
Question 2
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the number of moles of NaOH?
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 3
Determine the number of moles of electrons transferred during the electrolysis of a solution of copper(II) sulfate u\sing a current of 2.5 A for 2.0 hours. The s\tandard reduction potential of copper(II) ion is -0.34 V.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 4
Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4), 20% polypropylene (C3H6), and 20% polystyrene (C8H8).
A. 60 g/mol
B. 120 g/mol
C. 180 g/mol
D. 240 g/mol
Question 5
A 2.5 L flask contains 0.5 M H2(g). What is the partial pressure of H2(g) in the flask?
A. 0.1 atm
B. 0.2 atm
C. 0.3 atm
D. 0.4 atm
Question 6
The pH of a solution is 7. What is the concentration of the hydrogen ions?
A. 1 x 10^\( -7 \) M
B. 1 x 10^\( -6 \) M
C. 1 x 10^\( -5 \) M
D. 1 x 10^\( -4 \) M
Question 7
A 2.5 L flask contains 0.15 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?
A. 0.50 atm
B. 0.75 atm
C. 1.00 atm
D. 1.25 atm
Question 8
A 2.50 g sample of an unknown hydrocarbon is burned in a bomb calorimeter. The temperature of the calorimeter increases by 2.35°C. If the heat capacity of the calorimeter is 1.50 kJ/°C, what is the average bond energy of the hydrocarbon?
A. 400 kJ/mol
B. 450 kJ/mol
C. 500 kJ/mol
D. 550 kJ/mol
Question 9
A solution contains 0.1 M AgNO3 and 0.1 M NaCl. What is the concentration of Ag+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 10
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 298 K. Calculate the number of moles of nitrogen gas present in the sample.
A. 0.1 mol
B. 0.2 mol
C. 0.3 mol
D. 0.4 mol
Question 11
A 10.0 g sample of a polymer is dissolved in 100.0 mL of solvent. If the solution has a concentration of 0.5 g/mL, calculate the molar mass of the polymer.
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 12
A 5.0 M solution of H2SO4 is electrolyzed u\sing a platinum electrode. If the cell potential is 1.5 V, calculate the number of moles of O2 gas produced at the anode.
A. 0.02 mol
B. 0.04 mol
C. 0.06 mol
D. 0.08 mol
Question 13
A gas at 300 K has a volume of 2.5 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 3.125 L
B. 3.5 L
C. 4 L
D. 4.5 L
Question 14
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?
A. 0.25 L
B. 0.5 L
C. 0.75 L
D. 1 L
Question 15
A solution of 0.250 M NaCl is prepared by dissolving 10.0 g of NaCl in 1.00 L of water. What is the concentration of Cl- ions in the solution?
A. 0.125 M
B. 0.250 M
C. 0.500 M
D. 1.00 M

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: