POST UTME LAUTECH 2018 Chemistry | Objective

Are you preparing for POST UTME LAUTECH 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 glu\cose (C6H12O6) that can be obtained from 250g of a 30% glu\cose solution.
A. 0.5 mol
Correct B. 1.0 mol
C. 1.5 mol
D. 2.0 mol

Correct Answer: B

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Question 2
A 2.0 L flask contains 0.50 M H2SO4. What is the concentration of H+ ions in the solution?
A. 0.25 M
Correct B. 0.50 M
C. 0.75 M
D. 1.0 M

Correct Answer: B

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Question 3
A sample of a gas occupies 250 mL at 25°C and 1 atm. What is the volume of the gas at 50°C and 2 atm?
A. 125 mL
B. 250 mL
Correct C. 500 mL
D. 1000 mL

Correct Answer: C

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Question 4
A 10g sample of a polymer is dissolved in 100 mL of a solvent. What is the concentration of the polymer solution in g/L?
A. 10 g/L
Correct B. 20 g/L
C. 30 g/L
D. 40 g/L

Correct Answer: B

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Question 5
A 5.0 L flask 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 6
The reaction of sodium with water is a classic example of a redox reaction. Identify the type of redox reaction that occurs when sodium reacts with water.
A. Oxidation of sodium
B. Reduction of water
C. Oxidation of water and reduction of sodium
Correct D. Reduction of sodium and oxidation of water

Correct Answer: D

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Question 7
A sample of an unknown hydrocarbon is found to have a molecular formula of C5H12. What type of hydrocarbon is it?
Correct A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon

Correct Answer: A

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Question 8
A solution of copper(II) sulfate is electrolyzed u\sing a copper electrode. What is the result of the electrolysis?
Correct A. Deposition of copper
B. Oxidation of copper
C. Reduction of copper ions
D. No reaction occurs

Correct Answer: A

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Question 9
A sample of a gas is found to have a pressure of 2.5 atm and a volume of 5.0 L. What is the temperature of the gas in Kelvin?
A. 300 K
B. 400 K
Correct C. 500 K
D. 600 K

Correct Answer: C

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Question 10
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. What is the result of the titration?
A. Precipitation of sodium chloride
B. Formation of a buffer solution
Correct C. Neutralization of the acid
D. No reaction occurs

Correct Answer: C

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Question 11
At 298 K, the rate cons\tant of a reaction is 1.5 x 10^-3 s^-1. If the temperature is raised to 308 K, what is the new rate cons\tant?
A. 2.5 x 10^-3 s^-1
Correct B. 3.0 x 10^-3 s^-1
C. 4.0 x 10^-3 s^-1
D. 5.0 x 10^-3 s^-1

Correct Answer: B

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Question 12
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the resulting solution?
A. 0
Correct B. 1
C. 2
D. 3

Correct Answer: B

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Question 13
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?
A. 80,000 g/mol
B. 90,000 g/mol
Correct C. 100,000 g/mol
D. 110,000 g/mol

Correct Answer: C

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Question 14
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the concentration of the resulting solution?
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 15
A sample of a gas has a volume of 2.5 L at 298 K and 1 atm. What is the new volume of the gas at 308 K and 2 atm?
A. 3.0 L
Correct B. 3.5 L
C. 4.0 L
D. 4.5 L

Correct Answer: B

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Question 16
Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess oxygen according to the equation: C6H12O6 + 6O2 → 6CO2 + 6H2O. The molar mass of C6H12O6 is 180 g/mol.
A. 0.025 mol
Correct B. 0.05 mol
C. 0.075 mol
D. 0.1 mol

Correct Answer: B

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Question 17
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete. 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 18
A sample of 2.0 g of a polymer is dissolved in 100 mL of a solvent. The solution is then diluted to 500 mL. Calculate the molarity of the solution.
A. 0.01 M
Correct B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: B

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Question 19
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete. The dissociation cons\tant of H2SO4 is 10^-2.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 20
A sample of 1.0 g of a biomolecule is dissolved in 100 mL of a solvent. The solution is then diluted to 500 mL. Calculate the molarity of the solution.
A. 0.01 M
Correct B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: B

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Question 21
Determine the pH of a 0.1 M solution of a weak acid HA, given that the acid dissociation cons\tant (Ka) is 1.8 × 10^\( -5 \).
A. 2.0
Correct B. 3.0
C. 4.0
D. 5.0

Correct Answer: B

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Question 22
A 25 mL sample of 0.5 M NaOH is added to 50 mL of 0.1 M HCl. Calculate the concentration of the resulting solution.
A. 0.05 M
B. 0.1 M
Correct C. 0.15 M
D. 0.2 M

Correct Answer: C

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Question 23
A 2.5 g sample of an organic compound is burned in a combustion calorimeter. The heat of combustion is 12.5 kJ/g. Calculate the heat of combustion of 5.0 g of the compound.
A. 62.5 kJ
Correct B. 62.8 kJ
C. 63.1 kJ
D. 63.5 kJ

Correct Answer: B

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Question 24
A solution of 0.1 M NaCl is prepared by dissolving 0.1 g of NaCl in 100 mL of water. Calculate the molarity of the solution.
A. 0.01 M
Correct B. 0.1 M
C. 1.0 M
D. 10 M

Correct Answer: B

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Question 25
A 10 mL sample of 0.5 M H2SO4 is added to 20 mL of 0.2 M NaOH. Calculate the concentration of the resulting solution.
A. 0.05 M
B. 0.1 M
Correct C. 0.15 M
D. 0.2 M

Correct Answer: C

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