POST UTME PAN-ATLANTIC UNIVERSITY 2018 Chemistry | Objective

Are you preparing for POST UTME PAN-ATLANTIC UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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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