POST UTME WELLSPRING UNIVERSITY 2021 Chemistry | Objective

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Question 1
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 2
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 3
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 4
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 5
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 6
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 7
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+
Question 8
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 9
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 10
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 11
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).
A. -1207.6 kJ/mol
B. -1207.7 kJ/mol
C. -1207.8 kJ/mol
D. -1207.9 kJ/mol
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.
A. 125 mL
B. 250 mL
C. 375 mL
D. 500 mL
Question 13
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 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.
A. 7
B. 8
C. 9
D. 10
Question 15
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

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