POST UTME IMS U 2017 Chemistry | Objective

Are you preparing for POST UTME IMS U exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the molar mass of a polymer with the following composition: 60% by mass of polyethylene (C2H4) and 40% by mass of polypropylene (C3H6).
A. 120 g/mol
Correct B. 180 g/mol
C. 240 g/mol
D. 300 g/mol

Correct Answer: B

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Question 2
A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, calculate the mole \fraction of nitrogen gas.
A. 0.98
Correct B. 0.99
C. 0.995
D. 0.999

Correct Answer: B

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Question 3
A solution of sulfuric acid (H2SO4) is prepared by dissolving 50 g of the acid in 100 mL of water. If the density of the solution is 1.2 g/mL, calculate the molarity of the solution.
A. 2.0 M
Correct B. 2.5 M
C. 3.0 M
D. 3.5 M

Correct Answer: B

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Question 4
A reaction is represented by the equation: 2A + B → 2C + D. If 2.0 mol of A and 1.0 mol of B are present initially, and 1.0 mol of C is formed after 10 minutes, calculate the rate cons\tant (k) for the reaction.
A. 0.05 min^-1
Correct B. 0.10 min^-1
C. 0.20 min^-1
D. 0.30 min^-1

Correct Answer: B

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Question 5
A voltaic cell consists of a zinc anode and a copper cathode. If the s\tandard electrode potential of the zinc anode is -0.76 V and the s\tandard electrode potential of the copper cathode is +0.34 V, calculate the cell potential (Ecell) at 25°C.
Correct A. -0.42 V
B. -0.42 V
C. -0.42 V
D. -0.42 V

Correct Answer: A

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Question 6
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.25 M

Correct Answer: B

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Question 7
A reaction is represented by the equation: 2A + B → 2C + D. If 2 moles of A and 1 mole of B are present initially, and 1 mole of C is produced after 10 minutes, what is the rate of reaction?
A. 0.5 mol/min
Correct B. 1 mol/min
C. 2 mol/min
D. 5 mol/min

Correct Answer: B

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Question 8
A 1 L solution of H2SO4 contains 0.5 mol of H2SO4. What is the concentration of H+ ions in the solution?
A. 0.25 M
Correct B. 0.5 M
C. 1 M
D. 2 M

Correct Answer: B

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Question 9
A 0.1 M solution of NaOH is prepared by dissolving 2.5 g of NaOH in 100 mL of water. What is the concentration of OH- ions in the solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.25 M

Correct Answer: B

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Question 10
A reaction is represented by the equation: A + B → C + D. If 1 mole of A and 1 mole of B are present initially, and 1 mole of C is produced after 10 minutes, what is the rate of reaction?
A. 0.5 mol/min
Correct B. 1 mol/min
C. 2 mol/min
D. 5 mol/min

Correct Answer: B

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Question 11
The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
Correct A. 0.005 M
B. 0.05 M
C. 0.1 M
D. 0.5 M

Correct Answer: A

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Question 12
A 2.0 g sample of a metal is dissolved in 50 mL of 0.1 M HCl. If the reaction is 100% efficient, what is the number of moles of the metal dissolved?
A. 0.05 mol
Correct B. 0.1 mol
C. 0.2 mol
D. 0.5 mol

Correct Answer: B

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Question 13
A solution contains 0.1 M Cu^2+ ions. If 10 mL of this solution is added to 90 mL of 0.1 M NaOH, what is the concentration of Cu^2+ ions in the resulting solution?
A. 0.01 M
Correct B. 0.05 M
C. 0.1 M
D. 0.2 M

Correct Answer: B

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Question 14
A 2.0 g sample of a metal is dissolved in 50 mL of 0.1 M HCl. If the reaction is 100% efficient, what is the number of moles of the metal dissolved?
A. 0.05 mol
Correct B. 0.1 mol
C. 0.2 mol
D. 0.5 mol

Correct Answer: B

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Question 15
A solution contains 0.1 M Cu^2+ ions. If 10 mL of this solution is added to 90 mL of 0.1 M NaOH, what is the concentration of Cu^2+ ions in the resulting solution?
A. 0.01 M
Correct B. 0.05 M
C. 0.1 M
D. 0.2 M

Correct Answer: B

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Question 16
Determine the number of moles of CO2 produced when 2.5 g of calcium carbonate (CaCO3) is decomposed completely at cons\tant pressure and temperature.
A. 0.05 mol
Correct B. 0.1 mol
C. 0.15 mol
D. 0.2 mol

Correct Answer: B

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Question 17
A 2.5 M solution of HCl is prepared by dissolving 25 g of HCl in water to make 1 L of solution. What is the molarity of the solution?
A. 1.0 M
B. 2.0 M
Correct C. 2.5 M
D. 5.0 M

Correct Answer: C

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Question 18
A solution contains 0.1 M HCl and 0.2 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 19
A 2.5 g sample of a non-metallic element is heated in a crucible until it is completely vaporized. The mass of the crucible and its contents after heating is 3.2 g. What is the molar mass of the element?
A. 20 g/mol
B. 40 g/mol
Correct C. 60 g/mol
D. 80 g/mol

Correct Answer: C

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Question 20
A 1 L solution of 0.1 M NaOH is mixed with a 1 L solution of 0.2 M HCl. What is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 21
A 2.50 g sample of a compound containing only carbon and hydrogen is found to have an empirical formula of CH2O. Calculate the molar mass of the compound.
A. 46.06 g/mol
Correct B. 62.06 g/mol
C. 74.06 g/mol
D. 86.06 g/mol

Correct Answer: B

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Question 22
A solution contains 5.0 g of glu\cose (C6H12O6) dissolved in 50.0 mL of water. Calculate the concentration of the solution in g/L.
A. 0.10 g/L
Correct B. 1.00 g/L
C. 10.0 g/L
D. 100 g/L

Correct Answer: B

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Question 23
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. Calculate the pH of the resulting solution.
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 24
A sample of a gas has a volume of 2.5 L at a pressure of 1.5 atm. Calculate the temperature of the gas in Kelvin.
A. 300 K
Correct B. 400 K
C. 500 K
D. 600 K

Correct Answer: B

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Question 25
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. Calculate the concentration of the resulting solution.
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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