POST UTME UNIOSUN 2018 Chemistry | Objective

Are you preparing for POST UTME UNIOSUN 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 number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaC}_2$ is completely decomposed according to the equation: $\text{CaC}_2(s) \rightarrow \text{Ca}(s) + \text{C}(s) + \text{CO}_2(g)$
A. 0.050 mol
Correct B. 0.100 mol
C. 0.150 mol
D. 0.200 mol

Correct Answer: B

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Question 2
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\text{HCl}$ is required to reach the equivalence point, what is the number of moles of $\text{NaOH}$ in the solution?
A. 0.00250 mol
Correct B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol

Correct Answer: B

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Question 3
The diagram below shows a simple apparatus for measuring the solubility of a gas in a liquid. If the volume of the gas collected is 250 mL at a pressure of 750 mmHg and a temperature of 20°C, what is the partial pressure of the gas in the liquid?
Correct A. 600 mmHg
B. 700 mmHg
C. 800 mmHg
D. 900 mmHg

Correct Answer: A

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Question 4
A 2.00 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 12.0 kJ of heat energy. What is the molar mass of the hydrocarbon?
A. 20.0 g/mol
B. 30.0 g/mol
Correct C. 40.0 g/mol
D. 50.0 g/mol

Correct Answer: C

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Question 5
A diagram of a simple apparatus for measuring the solubility of a gas in a liquid is shown below. If the volume of the gas collected is 500 mL at a pressure of 1000 mmHg and a temperature of 25°C, what is the partial pressure of the gas in the liquid?
A. 800 mmHg
B. 900 mmHg
Correct C. 1000 mmHg
D. 1100 mmHg

Correct Answer: C

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Question 6
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 7
A polymer is formed from the condensation reaction of ethylene glycol and adipic acid. What is the molecular formula of the polymer?
A. (C2H4O2)n
Correct B. (C6H10O4)n
C. (C4H6O3)n
D. (C3H6O2)n

Correct Answer: B

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Question 8
A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. The resulting solution has a pH of 4.5. What is the molar concentration of the subs\tance?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 9
A 1.0 L solution of a strong acid has a pH of 1.0. What is the concentration of the acid?
A. 0.1 M
B. 0.2 M
C. 0.3 M
Correct D. 0.4 M

Correct Answer: D

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Question 10
A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. The resulting solution has a pH of 7.0. What is the molar concentration of the subs\tance?
A. 0.1 M
B. 0.2 M
Correct C. 0.3 M
D. 0.4 M

Correct Answer: C

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