POST UTME PAN-ATLANTIC UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Calculate the enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s). The s\tandard enthalpy of formation of Al2O3(s) is -1675 kJ/mol, and the s\tandard enthalpy of formation of Fe(s) is -13.8 kJ/mol.
A. -1650 kJ/mol
B. -1700 kJ/mol
C. -1600 kJ/mol
D. -1800 kJ/mol
Question 2
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 3
Determine the s\tandard enthalpy of formation of CaO(s) from the following data: ΔH°f(CaO(s)) = ?; ΔH°f(Ca(s)) = -1.85 kJ/mol; ΔH°f(O2(g)) = 0 kJ/mol; ΔH°f(CaO(s)) = -635.09 kJ/mol.
A. -1.85 kJ/mol
B. -635.09 kJ/mol
C. -1.85 kJ/mol + \( -635.09 kJ/mol \)
D. -1.85 kJ/mol + 0 kJ/mol
Question 4
A 0.1 M solution of a weak acid, HA, has a pH of 3. Determine the value of Ka.
A. 1.0 x 10^-3
B. 1.0 x 10^-4
C. 1.0 x 10^-5
D. 1.0 x 10^-6
Question 5
A 0.500 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A 0.100 M solution of Fe^2+ is electrolyzed for 2.00 hours. What is the mass of Fe deposited at the cathode?
A. 0.0100 g
B. 0.0200 g
C. 0.0300 g
D. 0.0400 g
Question 7
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 8
A 10.0 mL sample of a 0.100 M solution of NaOH is added to 50.0 mL of a 0.100 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
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 10
A 1.00 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 11
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 12
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 13
The following diagram shows a molecular structure of an alkane.
A. The molecule is an isomer of pen\tane.
B. The molecule is a stereoisomer of pen\tane.
C. The molecule is a geometric isomer of pen\tane.
D. The molecule is a structural isomer of pen\tane.
Question 14
A 1.0 M solution of HCl is titrated with a 1.0 M solution of NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 15
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

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