POST UTME WELLSPRING UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between sulfur dioxide and oxygen to form sulfur trioxide is a classic example of a reaction that is catalyzed by a metal ion. Which of the following metal ions is most likely to catalyze this reaction?
A. V2+
B. Cr3+
C. Mn2+
D. Fe3+
Question 2
The reaction between hydrogen peroxide and potassium iodide is a classic example of a reaction that is catalyzed by a metal ion. Which of the following metal ions is most likely to catalyze this reaction?
A. Cu2+
B. Fe3+
C. Mn2+
D. Cr3+
Question 3
A 2.50 L flask contains 0.250 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa
Question 4
A 100 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the pH of the resulting solution at the equivalence point.
A. 7
B. 8
C. 9
D. 10
Question 5
A 0.1 M solution of a monoprotic acid, HA, has a pH of 2.50. Calculate the concentration of the acid.
A. 0.1 M
B. 0.01 M
C. 0.001 M
D. 0.0001 M
Question 6
A 2.00 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the number of moles of gas present u\sing the ideal gas law.
A. 0.250 mol
B. 0.500 mol
C. 0.750 mol
D. 1.00 mol
Question 7
A 0.500 L solution contains 0.250 mol of NaCl. Calculate the molarity of the solution.
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 8
A solution of sodium hydroxide is electrolyzed u\sing a platinum electrode. What is the expected product at the anode?
A. H2O
B. NaOH
C. O2
D. H2
Question 9
A 250 mL sample of a solution containing 0.5 M NaCl is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 125 mL
B. 250 mL
C. 375 mL
D. 500 mL
Question 10
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance initially exists, how much will remain after 20.0 days?
A. 50.0 mg
B. 25.0 mg
C. 12.5 mg
D. 6.25 mg
Question 11
A 250 mL sample of a solution containing 0.5 M NaCl is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 125 mL
B. 250 mL
C. 375 mL
D. 500 mL
Question 12
A 100 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the pH of the resulting solution at the equivalence point.
A. 7
B. 8
C. 9
D. 10
Question 13
A 2.0 g sample of a metal, M, is dissolved in 20 mL of 1.0 M HCl. The resulting solution is then titrated with 1.0 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.1 mol
B. 0.2 mol
C. 0.3 mol
D. 0.4 mol
Question 14
A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the expected product at the cathode?
A. H2
B. Na
C. Cl2
D. HCl
Question 15
The reaction between sulfuric acid and sodium hydroxide is a classic example of a reaction that is catalyzed by a metal ion. Which of the following metal ions is most likely to catalyze this reaction?
A. Fe3+
B. Cr3+
C. Mn2+
D. Cu2+

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