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POST UTME IMS U 2024 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 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?

A. Oxygen gas

Correct B. Copper metal

C. Hydrogen gas

D. Sulfuric acid

Correct Answer: B

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Question 2

What is the correct order of electron affinity for the ha\logens?

Correct A. F > Cl > Br > I

B. I > Br > Cl > F

C. F > Br > Cl > I

D. I > Cl > Br > F

Correct Answer: A

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Question 3

A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

Correct A. 0.0500 M

B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: A

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Question 4

What is the major product of the reaction between ethene and bromine?

Correct A. 1,2-dibromoethane

B. 1,1-dibromoethane

C. 1,3-dibromoethane

D. 1,4-dibromoethane

Correct Answer: A

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Question 5

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

Correct A. 0.0500 M

B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: A

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Question 6

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 7

A 2.5 M solution of HCl is titrated with a 0.5 M solution of NaOH. What is the pH of the solution after 25 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 8

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will be left after 15 years?

Correct A. 25 g

B. 50 g

C. 75 g

D. 100 g

Correct Answer: A

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Question 9

A solution contains 0.1 M H2SO4 and 0.1 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 10

A 1.0 M solution of HCl is titrated with a 0.5 M solution of NaOH. What is the pH of the solution after 20 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 11

Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpies of formation for the reac\tants and products are: ΔHf(Al(s)) = -1261 kJ/mol, ΔHf(Fe2O3(s)) = -826 kJ/mol, ΔHf(Fe(s)) = 0 kJ/mol, and ΔHf(Al2O3(s)) = -1676 kJ/mol.

Correct A. -1454 kJ/mol

B. -1754 kJ/mol

C. -1654 kJ/mol

D. -1554 kJ/mol

Correct Answer: A

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Question 12

A sample of a hydrocarbon has a molecular formula of C4H10. If the density of the sample is 0.65 g/mL, what is the molar mass of the hydrocarbon?

A. 74 g/mol

Correct B. 84 g/mol

C. 94 g/mol

D. 104 g/mol

Correct Answer: B

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Question 13

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. 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 14

A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. What is the pressure of the gas?

Correct A. 2.5 atm

B. 3.5 atm

C. 4.5 atm

D. 5.5 atm

Correct Answer: A

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Question 15

A sample of a compound with the molecular formula C2H4O2 is analyzed by GC-MS and found to have a molecular ion peak at m/z 60. What is the structure of the compound?

A. CH3COCH3

Correct B. CH3COOH

C. CH3CH2OH

D. CH3COOCH3

Correct Answer: B

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Question 16

A 0.1 M solution of AgNO3 is mixed with a 0.1 M solution of NaCl. If the initial concentrations of Ag+ and Cl- ions are 0.1 M each, what is the concentration of AgCl formed after the reaction is complete?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 17

A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the metal oxide has a molar mass of 120 g/mol and the reaction is 100% efficient, what is the mass of the metal oxide produced?

A. 1.2 g

B. 1.5 g

Correct C. 1.8 g

D. 2.0 g

Correct Answer: C

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Question 18

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If the initial concentrations of H+ and OH- ions are 1.0 M each, 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 19

A 2.0 g sample of a metal hydroxide is dissolved in water to produce a solution with a pH of 10. If the molar mass of the metal hydroxide is 80 g/mol, what is the concentration of the metal hydroxide in the solution?

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 20

A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. If the initial concentrations of OH- and H+ ions are 1.0 M each, what is the concentration of NaCl formed 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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