POST UTME WELLSPRING UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME WELLSPRING UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Chemistry (Objective) questions designed to simulate the real exam environment.

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?
Correct A. V2+
B. Cr3+
C. Mn2+
D. Fe3+

Correct Answer: A

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Question 2
A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the expected product at the cathode?
Correct A. H2
B. Na
C. Cl2
D. HCl

Correct Answer: A

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Question 3
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?
Correct A. Cu2+
B. Fe3+
C. Mn2+
D. Cr3+

Correct Answer: A

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Question 4
A solution of sodium hydroxide is electrolyzed u\sing a platinum electrode. What is the expected product at the anode?
A. H2O
B. NaOH
Correct C. O2
D. H2

Correct Answer: C

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Question 5
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+
Correct D. Cu2+

Correct Answer: D

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Question 6
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, ΔHf(C(s)) = 0 kJ/mol. Assume the reaction is CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1207.6 kJ/mol
B. -1207.7 kJ/mol
C. -1207.8 kJ/mol
D. -1207.9 kJ/mol

Correct Answer: A

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Question 7
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.
Correct A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa

Correct Answer: A

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Question 8
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
Correct D. 6.25 mg

Correct Answer: D

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Question 9
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
Correct C. 1.00 M
D. 1.25 M

Correct Answer: C

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Question 10
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
Correct B. 0.500 mol
C. 0.750 mol
D. 1.00 mol

Correct Answer: B

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Question 11
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
Correct C. 0.001 M
D. 0.0001 M

Correct Answer: C

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Question 12
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.
Correct A. 125 mL
B. 250 mL
C. 375 mL
D. 500 mL

Correct Answer: A

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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
Correct B. 0.2 mol
C. 0.3 mol
D. 0.4 mol

Correct Answer: B

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Question 14
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.
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 15
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.
Correct A. 125 mL
B. 250 mL
C. 375 mL
D. 500 mL

Correct Answer: A

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Question 16
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
Correct B. 0.2 mol
C. 0.3 mol
D. 0.4 mol

Correct Answer: B

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Question 17
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

Correct Answer: VIEW ANSWER

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