POST UTME PAN-ATLANTIC UNIVERSITY 2019 Chemistry | Objective

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Question 1
The reaction between potassium permanganate and oxalic acid is a classic example of a redox reaction. Write the balanced half-equations for the oxidation and reduction reactions.
A. Oxidation: MnO4- → Mn2+ + 4H2O; Reduction: C2O42- + 2H+ → 2CO2 + H2O
B. Oxidation: MnO4- → MnO2 + 2H2O; Reduction: C2O42- + 2H+ → 2CO2 + H2O
C. Oxidation: MnO4- → MnO2 + 2H2O; Reduction: C2O42- → CO2 + H2O
D. Oxidation: MnO4- → Mn2+ + 4H2O; Reduction: C2O42- → CO2 + H2O
Question 2
A 2.50 M solution of HCl is titrated with 1.00 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 3
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 7.00, what is the volume of NaOH added?
A. 10.0 mL
B. 12.5 mL
C. 15.0 mL
D. 17.5 mL
Question 4
The equilibrium cons\tant (Kc) for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) is 4.5 × 10^\( -4 \) at 500 K. Calculate the equilibrium cons\tant (Kp) for the reaction at the same temperature.
A. 1.2 × 10^\( -3 \)
B. 4.5 × 10^\( -4 \)
C. 1.8 × 10^\( -3 \)
D. 6.0 × 10^\( -4 \)
Question 5
A 50.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 50.0 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -285.8 kJ/mol
B. -393.5 kJ/mol
C. -241.8 kJ/mol
D. -483.5 kJ/mol
Question 7
A 2.00 M solution of H2SO4 is titrated with 1.00 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
The rate cons\tant (k) for a first-order reaction is given by the equation: k = 2.303/t \log[A]0/[A]t. If the initial concentration of a reac\tant is 0.1 M and the concentration after 10 minutes is 0.05 M, calculate the rate cons\tant (k) for the reaction.
A. 0.693 min^-1
B. 1.386 min^-1
C. 2.303 min^-1
D. 3.302 min^-1
Question 9
A 2.00 L sample of a gas at 25°C and 1.00 atm is compressed to 0.500 L at the same temperature. What is the new pressure?
A. 2.00 atm
B. 4.00 atm
C. 6.00 atm
D. 8.00 atm
Question 10
The following diagram shows a titration setup for the determination of the concentration of a strong acid.
A. The burette contains the strong acid.
B. The beaker contains the strong acid.
C. The burette contains the strong base.
D. The beaker contains the strong base.
Question 11
A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 50 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 50 mL
B. 75 mL
C. 100 mL
D. 125 mL
Question 12
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?
A. 1
B. 2
C. 3
D. 4
Question 13
A 2.5 M solution of HCl is titrated with 0.5 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 1.3
B. 2.5
C. 3.5
D. 4.5
Question 14
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 50 mL of HCl has been added.
A. 2
B. 3
C. 4
D. 5
Question 15
A 5.00 g sample of a polymer is dissolved in 100.0 mL of a solvent. What is the concentration of the polymer solution?
A. 0.0500 g/mL
B. 0.100 g/mL
C. 0.150 g/mL
D. 0.200 g/mL

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