POST UTME MADONNA UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the s\tandard potential of the cell represented by the following reaction: MnO4- (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (l).
A. -1.51 V
B. -1.23 V
C. -1.68 V
D. -1.93 V
Question 2
A solution of NaOH is added to a solution of HCl. What is the resulting solution?
A. A solution of NaCl
B. A solution of NaOH
C. A solution of HCl
D. A solution of water
Question 3
A sample of a solid is placed in a beaker and 50 mL of water is added. The resulting solution is heated to 90°C. What is the new volume of the solution?
A. 50 mL
B. 100 mL
C. 150 mL
D. 200 mL
Question 4
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 5
A 15.0 mL sample of 0.200 M H2SO4 is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 6
A metal reacts with oxygen to form a basic oxide. Which of the following metals is likely to form a basic oxide?
A. Aluminum
B. Copper
C. Zinc
D. Iron
Question 7
A solution of 0.100 M sodium nitrate (NaNO3) is mixed with a solution of 0.100 M barium chloride (BaCl2). What is the concentration of the resulting solution?
A. 0.100 M
B. 0.0500 M
C. 0.0250 M
D. 0.0125 M
Question 8
A 2.00 M solution of H2SO4 is prepared by dissolving 60.0 g of H2SO4 in enough water to make 1.00 L of solution. What is the molarity of the solution?
A. 2.00 M
B. 2.50 M
C. 3.00 M
D. 3.50 M
Question 9
A 20.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. Calculate the number of moles of NaOH required.
A. 0.0125
B. 0.0250
C. 0.0375
D. 0.0500
Question 10
A 100 mL sample of a 0.1 M solution of NaOH is mixed with 100 mL of a 0.2 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 11
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 3
B. 4
C. 5
D. 6
Question 12
A 1.00 L sample of a gas at 25.0°C and 1.00 atm is found to have a pressure of 2.00 atm at 50.0°C. Calculate the volume of the gas at 25.0°C and 1.00 atm.
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 13
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 7
D. 14
Question 14
A 10.0 mL sample of 0.200 M H2SO4 is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 15
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL

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