POST UTME MADONNA UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 L flask contains 0.50 M H2S. Calculate the number of moles of H2S present in the flask.
A. 0.50 mol
B. 1.0 mol
C. 2.0 mol
D. 3.0 mol
Question 2
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 3
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 4
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 15.0 mL of NaOH.
A. ( 3.00 )
B. ( 4.00 )
C. ( 5.00 )
D. ( 6.00 )
Question 5
A solution contains 0.100 M NaCl and 0.100 M KNO3. What is the concentration of Cl- ions in the solution?
A. 0.100 M
B. 0.0500 M
C. 0.0750 M
D. 0.0250 M
Question 6
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 7
A 2.5 L flask contains 0.50 M CH3OH. Calculate the number of moles of CH3OH present in the flask.
A. 0.50 mol
B. 1.25 mol
C. 2.50 mol
D. 5.00 mol
Question 8
A sample of gas occupies 2.5 L at 27°C and 1.0 atm. Calculate the volume of the gas at 37°C and 1.5 atm, assuming ideal gas behavior.
A. 3.2 L
B. 4.1 L
C. 5.0 L
D. 6.3 L
Question 9
A 1.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1.0 L of water. What is the concentration of OH- ions in the solution?
A. 0.10 M
B. 0.25 M
C. 0.50 M
D. 1.0 M
Question 10
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 11
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 12
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 13
A metal rod has a length of 2.5 m and a cross-sectional area of 0.05 m^2. If a force of 500 N is applied to the rod, what is the stress on the rod?
A. 1000 Pa
B. 500 Pa
C. 2000 Pa
D. 2500 Pa
Question 14
A 1.0 L flask contains 0.50 M SO2. Calculate the partial pressure of SO2 in the flask at 25°C.
A. 0.50 atm
B. 1.0 atm
C. 2.0 atm
D. 3.0 atm
Question 15
The diagram below shows a titration setup. Identify the part labeled B.
A. A burette
B. A beaker
C. A test tube
D. A cell

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: