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POST UTME MOUNTAIN TOP UNIVERSITY 2025 Chemistry | Objective

Are you preparing for POST UTME MOUNTAIN TOP UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 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 acetic acid (CH3COOH) at 25°C.

Correct A. 4.75

B. 5.75

C. 6.75

D. 7.75

Correct Answer: A

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Question 2

A 25 mL sample of a solution containing 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the number of moles of HCl that react with NaOH.

A. 0.025

Correct B. 0.05

C. 0.075

D. 0.1

Correct Answer: B

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Question 3

A metal (X) reacts with oxygen to form a basic oxide. The reaction is as follows: 4X + 3O2 → 2X2O3. If 2.5 g of X is heated in air, calculate the volume of oxygen required.

A. 0.5 L

Correct B. 1 L

C. 1.5 L

D. 2 L

Correct Answer: B

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Question 4

A 10 mL sample of a solution containing 0.1 M H2SO4 is titrated with 0.1 M NaOH. Calculate the pH of the solution after the titration.

A. 2

B. 3

C. 4

Correct D. 5

Correct Answer: D

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Question 5

A 25 mL sample of a solution containing 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the number of moles of HCl that react with NaOH.

A. 0.025

Correct B. 0.05

C. 0.075

D. 0.1

Correct Answer: B

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Question 6

The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?

A. 1,2-dibromocyclohexane

Correct B. 1,4-dibromocyclohexane

C. cis-1,2-dibromocyclohexane

D. trans-1,2-dibromocyclohexane

Correct Answer: B

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Question 7

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

Correct A. -110.5 kJ/mol

B. -393.5 kJ/mol

C. 110.5 kJ/mol

D. 393.5 kJ/mol

Correct Answer: A

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Question 8

A 2.50-g sample of a non-volatile solute is dissolved in 25.0 g of water to give a solution with a boiling point elevation of 0.500°C. What is the molar mass of the solute?

A. 50.0 g/mol

Correct B. 100.0 g/mol

C. 200.0 g/mol

D. 500.0 g/mol

Correct Answer: B

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Question 9

The diagram below shows a titration setup.

A. The burette contains NaOH.

Correct B. The beaker contains HCl.

C. The burette contains HCl.

D. The beaker contains NaOH.

Correct Answer: B

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Question 10

The reaction of ammonia with oxygen produces nitrogen and water. What is the balanced equation for this reaction?

Correct A. 4NH_3(g) + 5O_2(g) \rightarrow 4NO(g) + 6H_2O(g)

B. 2NH_3(g) + 3O_2(g) \rightarrow 2NO(g) + 3H_2O(g)

C. NH_3(g) + O_2(g) \rightarrow NO(g) + H_2O(g)

D. NH_3(g) + O_2(g) \rightarrow NO_2(g) + H_2O(g)

Correct Answer: A

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Question 11

The polymerization of styrene to form polystyrene is an example of a ______________ reaction.

A. chain reaction

Correct B. addition reaction

C. condensation reaction

D. substitution reaction

Correct Answer: B

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Question 12

The compound with the molecular formula C2H6O is an example of a ______________.

A. aldehyde

B. ketone

Correct C. alcohol

D. ether

Correct Answer: C

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Question 13

The pH of a solution can be calculated u\sing the ______________ equation.

A. \( pH = \log[H^+] \)

Correct B. \( pH = -\log[H^+] \)

C. \( pH = \log[H^+] + 1 \)

D. \( pH = -\log[H^+] + 1 \)

Correct Answer: B

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Question 14

The compound with the molecular formula NO2 is an example of a ______________.

A. oxide

B. nitrate

Correct C. nitrite

D. nitrogen gas

Correct Answer: C

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Question 15

The reaction between sodium hydroxide and hydrochloric acid is an example of a ______________ reaction.

Correct A. neutralization reaction

B. oxidation-reduction reaction

C. combustion reaction

D. decomposition reaction

Correct Answer: A

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Question 16

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 17

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.

A. 100 g/mol

B. 200 g/mol

Correct C. 50 g/mol

D. 25 g/mol

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. Calculate the pH of the resulting solution.

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 19

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

Correct A. 25.0 mL

B. 50.0 mL

C. 75.0 mL

D. 100 mL

Correct Answer: A

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Question 20

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. Calculate the concentration of the resulting solution.

A. 0.50 M

B. 0.75 M

Correct C. 1.0 M

D. 1.25 M

Correct Answer: C

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Question 21

The electrolysis of a molten ionic compound, such as sodium chloride, produces sodium metal and chlorine gas. What is the half-reaction at the cathode?

Correct A. Na^+ + e^- → Na

B. Cl^- + e^- → Cl

C. Na^+ + e^- → Na^2+

D. Cl^- + e^- → Cl^2-

Correct Answer: A

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Question 22

A solution of copper(II) sulfate is electrolyzed u\sing a copper electrode. What is the result of the electrolysis?

A. Copper metal is deposited at the anode.

Correct B. Copper metal is deposited at the cathode.

C. Sulfuric acid is produced at the anode.

D. Sulfuric acid is produced at the cathode.

Correct Answer: B

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Question 23

The reaction of an alkene with a strong acid, such as sulfuric acid, produces an alkyl hydrogen sulfate. What is the name of the product?

Correct A. Alkyl hydrogen sulfate

B. Alkyl hydrogen sulfonate

C. Alkyl hydrogen sulfite

D. Alkyl hydrogen sulfide

Correct Answer: A

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Question 24

The atomic radius of an element increases as you move down a group in the periodic table. What is the reason for this tr\end?

Correct A. The atomic radius increases due to the addition of new energy levels.

B. The atomic radius increases due to the increase in the number of protons.

C. The atomic radius increases due to the decrease in the effective nuclear charge.

D. The atomic radius increases due to the increase in the number of electrons.

Correct Answer: A

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Question 25

The reaction of a metal with a strong acid produces hydrogen gas. What is the name of the reaction?

Correct A. Metal-acid reaction

B. Oxidation-reduction reaction

C. Neutralization reaction

D. Combustion reaction

Correct Answer: A

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