POST UTME MADONNA UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a titration setup. If 25.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH, what is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 2
A solution contains 25 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 3.0 M
Question 3
A 2.5 M solution of HCl is prepared by dissolving 25.0 g of HCl in 1.0 L of water. What is the concentration of H+ ions in the solution?
A. 0.10 M
B. 0.25 M
C. 0.50 M
D. 1.0 M
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
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 6
A sample of water contains 10^20 molecules. If the sample is heated from 20°C to 80°C, what is the change in the average kinetic energy of the molecules?
A. 1.5 kJ/mol
B. 2.5 kJ/mol
C. 3.5 kJ/mol
D. 4.5 kJ/mol
Question 7
In a redox reaction, what is the role of the catalyst in the electrolysis of water?
A. To increase the rate of reaction
B. To decrease the rate of reaction
C. To facilitate the transfer of electrons
D. To increase the pH of the solution
Question 8
A 2.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water and diluting to a total volume of 1.0 L. What is the molarity of the resulting solution?
A. 1.0 M
B. 2.0 M
C. 4.0 M
D. 8.0 M
Question 9
A 2.0 L flask contains 0.5 mol of N2 and 0.5 mol of O2 at 298 K. What is the equilibrium cons\tant for the reaction 2N2 + O2 ⇌ 2N2O?
A. 1.0 x 10^5
B. 1.0 x 10^3
C. 1.0 x 10^2
D. 1.0 x 10^-2
Question 10
A solution of 0.1 M NaCl is electrolyzed u\sing a platinum electrode. What is the concentration of Cl2 produced at the anode after 2 hours?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 11
A 2.0 L flask contains 0.5 mol of CO and 0.5 mol of O2 at 298 K. What is the equilibrium cons\tant for the reaction CO + 1/2O2 ⇌ CO2?
A. 1.0 x 10^5
B. 1.0 x 10^3
C. 1.0 x 10^2
D. 1.0 x 10^-2
Question 12
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 1.00 atm
B. 0.976 atm
C. 1.024 atm
D. 1.048 atm
Question 13
The reaction between zinc metal and copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 25.0 g of zinc metal is added to 250 mL of 0.100 M copper(II) sulfate solution, what is the limiting reac\tant?
A. Zinc metal
B. Copper(II) sulfate solution
C. Neither zinc metal nor copper(II) sulfate solution is the limiting reac\tant
D. Both zinc metal and copper(II) sulfate solution are the limiting reac\tants
Question 14
A 5.0 g sample of a polymer is dissolved in 100.0 mL of solvent. If the solution has a density of 1.0 g/mL, what is the concentration of the polymer in g/L?
A. 0.050 g/L
B. 0.100 g/L
C. 0.500 g/L
D. 1.000 g/L
Question 15
A 1.0 L flask contains 0.1 M H2S and 0.1 M O2 at 298 K. What is the concentration of H2O produced after 1 hour?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M

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