POST UTME PAN-ATLANTIC UNIVERSITY 2018 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
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s).
Correct A. -837 kJ/mol
B. -837 kJ/mol
C. -837 kJ/mol
D. -837 kJ/mol

Correct Answer: A

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Question 3 View Details
A 25.0 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH after the addition of 20.0 mL of NaOH.
A. 2
B. 3
C. 4
Correct D. 5

Correct Answer: D

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Question 4 View Details
The diagram below shows a titration setup.
Correct A. The burette contains HCl.
B. The burette contains NaOH.
C. The beaker contains HCl.
D. The beaker contains NaOH.

Correct Answer: A

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Question 5 View Details
Calculate the molar mass of a compound that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.
A. 60 g/mol
B. 80 g/mol
Correct C. 100 g/mol
D. 120 g/mol

Correct Answer: C

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Question 6 View Details
The solubility of a sparingly soluble salt, AgCl, in water is 1.2 x 10^-5 mol/L at 25°C. If 2.0 g of AgCl is dissolved in 1.0 L of water, what is the concentration of Ag+ ions in the solution?
A. 1.2 x 10^-5 M
Correct B. 2.4 x 10^-5 M
C. 4.8 x 10^-5 M
D. 6.0 x 10^-5 M

Correct Answer: B

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Question 7 View Details
A solution contains 0.10 M NaCl. What is the concentration of Cl- ions in the solution?
Correct A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M

Correct Answer: A

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Question 8 View Details
A 1.0 L solution contains 0.50 M HCl. What is the concentration of H+ ions in the solution?
Correct A. 0.50 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: A

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Question 9 View Details
A 2.0 L solution contains 0.20 M NaOH. What is the concentration of OH- ions in the solution?
A. 0.10 M
Correct B. 0.20 M
C. 0.30 M
D. 0.40 M

Correct Answer: B

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Question 10 View Details
A 1.0 L solution contains 0.50 M H2SO4. What is the concentration of H+ ions in the solution?
Correct A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M

Correct Answer: A

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Question 11 View Details
The reaction of nitrogen with oxygen to form nitrogen dioxide is highly exothermic. Calculate the s\tandard enthalpy change (ΔH) for this reaction u\sing the following data: ΔHf(N2) = 0 kJ/mol, ΔHf(O2) = 0 kJ/mol, ΔHf(NO2) = 59.2 kJ/mol. Assume that the reaction occurs at 298 K.
Correct A. -59.2 kJ/mol
B. 59.2 kJ/mol
C. -118.4 kJ/mol
D. 118.4 kJ/mol

Correct Answer: A

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Question 12 View Details
A 2.5 M solution of sulfuric acid (H2SO4) is mixed with a 1.5 M solution of sodium hydroxide (NaOH). Calculate the concentration of the resulting solution after the reaction is complete.
A. 1.0 M
B. 1.5 M
Correct C. 2.0 M
D. 2.5 M

Correct Answer: C

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Question 13 View Details
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 15 years?
Correct A. 12.5 g
B. 25 g
C. 50 g
D. 100 g

Correct Answer: A

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Question 14 View Details
The reaction of hydrogen gas with chlorine gas to form hydrogen chloride is highly exothermic. Calculate the s\tandard enthalpy change (ΔH) for this reaction u\sing the following data: ΔHf(H2) = 0 kJ/mol, ΔHf(Cl2) = 0 kJ/mol, ΔHf(HCl) = -92.3 kJ/mol. Assume that the reaction occurs at 298 K.
Correct A. -92.3 kJ/mol
B. 92.3 kJ/mol
C. -184.6 kJ/mol
D. 184.6 kJ/mol

Correct Answer: A

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Question 15 View Details
A 1.0 M solution of sodium carbonate (Na2CO3) is mixed with a 2.0 M solution of hydrochloric acid (HCl). Calculate the concentration of the resulting solution after the reaction is complete.
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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