POST UTME SKYLINE UNIVERSITY 2017 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 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20.0 mL of NaOH?
A. 2
Correct B. 3
C. 4
D. 5

Correct Answer: B

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Question 3 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 4 View Details
A 25.0 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 25.0 mL of NaOH?
A. 2
B. 3
C. 4
Correct D. 5

Correct Answer: D

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Question 5 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after the addition of 10.0 mL of 0.1 M HCl?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 6 View Details
Determine the s\tandard electrode potential (E°) of the reaction: MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. Given that the s\tandard electrode potential of the reduction of MnO4- is -1.23 V.
A. -1.23 V
Correct B. -0.76 V
C. -0.93 V
D. -1.63 V

Correct Answer: B

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Question 7 View Details
A 0.5 M solution of HCl is titrated with a 0.5 M solution of NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 2.00
Correct B. 2.50
C. 3.00
D. 3.50

Correct Answer: B

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Question 8 View Details
The diagram below shows a setup for electrolysis of a solution of CuSO4.
Correct A. Cu2+ ions are reduced at the cathode.
B. Cu2+ ions are oxidized at the anode.
C. H2O is reduced at the cathode.
D. H2O is oxidized at the anode.

Correct Answer: A

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Question 9 View Details
The diagram below shows a setup for electrolysis of a solution of CuSO4.
Correct A. Cu2+ ions are reduced at the cathode.
B. Cu2+ ions are oxidized at the anode.
C. H2O is reduced at the cathode.
D. H2O is oxidized at the anode.

Correct Answer: A

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Question 10 View Details
The diagram below shows a setup for electrolysis of a solution of CuSO4.
Correct A. Cu2+ ions are reduced at the cathode.
B. Cu2+ ions are oxidized at the anode.
C. H2O is reduced at the cathode.
D. H2O is oxidized at the anode.

Correct Answer: A

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Question 11 View Details
The reaction between nitrogen dioxide and water is given by the equation: 3NO2 + H2O → 2HNO3 + NO. If 2.5 moles of NO2 react with excess water, what is the limiting reac\tant?
Correct A. NO2
B. H2O
C. HNO3
D. NO

Correct Answer: A

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Question 12 View Details
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 13 View Details
The diagram below shows a titration setup. What is the purpose of the burette?
Correct A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution

Correct Answer: A

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Question 14 View Details
The reaction between sulfur dioxide and oxygen is given by the equation: 2SO2 + O2 → 2SO3. If 1 mole of SO2 reacts with excess oxygen, what is the limiting reac\tant?
Correct A. SO2
B. O2
C. SO3
D. None of the above

Correct Answer: A

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Question 15 View Details
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 16 View Details
Determine the pH of a 0.1 M solution of HCl after 20 mL of 0.1 M NaOH has been added to 20 mL of the HCl solution. Assume the volume of the resulting solution is 40 mL.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 17 View Details
A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. Calculate the molar mass of the polymer if the osmotic pressure of the solution is 1.5 atm at 25°C.
A. 1000
B. 2000
Correct C. 3000
D. 4000

Correct Answer: C

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Question 18 View Details
A 25 mL sample of a 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. Calculate the volume of NaOH 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 19 View Details
A 1.5 g sample of a metal carbonate is heated to produce a metal oxide. Calculate the mass of the metal oxide produced if the metal carbonate has a molar mass of 100 g/mol and the metal oxide has a molar mass of 50 g/mol.
A. 0.75 g
B. 1.0 g
Correct C. 1.25 g
D. 1.5 g

Correct Answer: C

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Question 20 View Details
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after 20 mL of NaOH has been added to 20 mL of the HCl solution. Assume the volume of the resulting solution is 40 mL.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 21 View Details
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of zinc in the product ZnSO4?
A. 0
Correct B. +2
C. -2
D. +1

Correct Answer: B

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Question 22 View Details
A sample of a polymer is analyzed and found to have a molecular weight of 50,000 g/mol. If the polymer is composed of 80% by weight of a repeating unit with a molecular weight of 100 g/mol, what is the degree of polymerization?
Correct A. 500
B. 250
C. 100
D. 50

Correct Answer: A

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Question 23 View Details
The reaction of sodium hydroxide with hydrochloric acid is represented by the equation: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l). What is the pH of the solution after the reaction?
Correct A. 7
B. 10
C. 14
D. 0

Correct Answer: A

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Question 24 View Details
A sample of a non-metallic element is analyzed and found to have a mass of 10 g. If the element has a density of 2.5 g/cm^3, what is the volume of the sample?
A. 4 cm^3
Correct B. 8 cm^3
C. 12 cm^3
D. 16 cm^3

Correct Answer: B

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Question 25 View Details
A sample of a metal is analyzed and found to have a mass of 20 g. If the metal has a density of 8 g/cm^3, what is the volume of the sample?
A. 2.5 cm^3
B. 5 cm^3
Correct C. 10 cm^3
D. 15 cm^3

Correct Answer: C

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