POST UTME PAN-ATLANTIC UNIVERSITY 2019 Chemistry | Objective

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Question 1 View Details
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 2 View Details
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
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 3 View Details
A 10.0 g sample of a mixture of NaCl and KCl is dissolved in 100.0 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.3 M
D. 0.4 M

Correct Answer: C

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Question 4 View Details
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
Correct D. 4

Correct Answer: D

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Question 5 View Details
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
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 6 View Details
A 0.1 M solution of a weak base, B, has a pH of 8. Determine the value of Kb.
Correct A. 1.0 x 10^-5
B. 1.0 x 10^-4
C. 1.0 x 10^-3
D. 1.0 x 10^-2

Correct Answer: A

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Question 7 View Details
A 2.0 g sample of a polymer is dissolved in 100 mL of solvent. If the solution has a vis\cosity of 0.5 Pa·s, what is the molar mass of the polymer?
A. 1000 g/mol
B. 2000 g/mol
Correct C. 5000 g/mol
D. 10000 g/mol

Correct Answer: C

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Question 8 View Details
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
Correct B. 50 mL
C. 75 mL
D. 100 mL

Correct Answer: B

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Question 9 View Details
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
Correct C. 1.0 x 10^-5
D. 1.0 x 10^-6

Correct Answer: C

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Question 10 View Details
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
Correct B. 75 mL
C. 100 mL
D. 125 mL

Correct Answer: B

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Question 11 View Details
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
Correct C. -1.85 kJ/mol + \( -635.09 kJ/mol \)
D. -1.85 kJ/mol + 0 kJ/mol

Correct Answer: C

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Question 12 View Details
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
Correct B. 3.00
C. 4.00
D. 5.00

Correct Answer: B

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Question 13 View Details
The reaction 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant of 1.5 × 10^\( -3 \) s^\( -1 \) at 298 K. What is the rate of reaction when [NO] = 0.100 M and [O2] = 0.0500 M?
A. 1.5 × 10^\( -4 \) M/s
B. 3.0 × 10^\( -4 \) M/s
Correct C. 4.5 × 10^\( -4 \) M/s
D. 6.0 × 10^\( -4 \) M/s

Correct Answer: C

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Question 14 View Details
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
Correct B. 0.0200 g
C. 0.0300 g
D. 0.0400 g

Correct Answer: B

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Question 15 View Details
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
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 16 View Details
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 17 View Details
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.
Correct A. -1650 kJ/mol
B. -1700 kJ/mol
C. -1600 kJ/mol
D. -1800 kJ/mol

Correct Answer: A

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Question 18 View Details
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 25 mL of HCl has been added.
A. 2
Correct B. 3
C. 4
D. 5

Correct Answer: B

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Question 19 View Details
A 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. Calculate the pH of the solution after 50 mL of NaOH has been added.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 20 View Details
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
Correct C. 4
D. 5

Correct Answer: C

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Question 21 View Details
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
Correct B. 12.5 mL
C. 15.0 mL
D. 17.5 mL

Correct Answer: B

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Question 22 View Details
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 100 g/mol
B. 200 g/mol
Correct C. 250 g/mol
D. 500 g/mol

Correct Answer: C

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Question 23 View Details
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
Correct C. 6.00 atm
D. 8.00 atm

Correct Answer: C

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Question 24 View Details
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
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 25 View Details
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
Correct B. 0.100 g/mL
C. 0.150 g/mL
D. 0.200 g/mL

Correct Answer: B

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