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POST UTME COVENANT UNIVERSITY 2025 Chemistry | Objective

Are you preparing for POST UTME COVENANT 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.

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Question 1

Determine the s\tandard potential of the cell represented by the following reaction: Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s). The s\tandard reduction potentials for Zn2+/Zn and Ag+/Ag are -0.76 V and 0.80 V, respectively.

Correct A. -0.04 V

B. 0.04 V

C. 0.76 V

D. 0.80 V

Correct Answer: A

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Question 2

A 25.0 mL sample of 0.100 M NaOH is mixed with a 25.0 mL sample of 0.100 M HCl. What is 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 3

A polymer has the following structure: [-CH2-CH2-CH2-CH2-]n. What is the IUPAC name of this polymer?

Correct A. Polyethylene

B. Polypropylene

C. Polyvinyl chloride

D. Polystyrene

Correct Answer: A

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Question 4

A 2.50 g sample of a subs\tance is dissolved in 25.0 mL of water. The resulting solution has a concentration of 0.100 M. What is the molar mass of the subs\tance?

A. 10.0 g/mol

Correct B. 20.0 g/mol

C. 30.0 g/mol

D. 40.0 g/mol

Correct Answer: B

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Question 5

A 10.0 mL sample of a solution containing 0.100 M NaOH is mixed with a 10.0 mL sample of a solution containing 0.100 M HCl. What is the resulting pH?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 6

Determine the pH of a 0.01 M solution of 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 sample of a polymer has a molecular weight of 100,000 g/mol. If 2.5 g of the polymer is dissolved in 50 mL of water, what is the concentration of the solution in g/L?

A. 0.05 g/L

Correct B. 0.5 g/L

C. 5 g/L

D. 50 g/L

Correct Answer: B

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Question 8

A 2.5 M solution of H2SO4 is titrated with 1 M 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 9

A sample of nitrogen gas is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the partial pressure of nitrogen?

A. 0.98 atm

B. 0.99 atm

Correct C. 1.01 atm

D. 1.02 atm

Correct Answer: C

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Question 10

A 1.0 M solution of HCl is titrated with 1.0 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 11

A 2.5 g sample of a polymer is dissolved in 100 mL of a solvent. If the molar mass of the polymer is 50,000 g/mol, calculate the number of moles of the polymer dissolved.

Correct A. 0.05 mol

B. 0.005 mol

C. 0.5 mol

D. 0.005 mol

Correct Answer: A

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Question 12

A redox reaction involves the oxidation of Cu(s) to Cu2+(aq) and the reduction of Ag+(aq) to Ag(s). Write the balanced half-equations for the reaction.

A. Cu(s) → Cu2+(aq) + 2e-

B. Ag+(aq) + e- → Ag(s)

Correct C. Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s)

D. Cu2+(aq) + 2e- → Cu(s)

Correct Answer: C

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Question 13

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, calculate the volume of HCl required to reach the equivalence point.

Correct A. 200 mL

B. 20 mL

C. 2 mL

D. 2000 mL

Correct Answer: A

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Question 14

A metal M has a density of 8.5 g/cm3 and a molar mass of 120 g/mol. If a 2.5 g sample of the metal is dissolved in acid, calculate the volume of the metal in cm3.

Correct A. 0.29 cm3

B. 2.9 cm3

C. 29 cm3

D. 0.029 cm3

Correct Answer: A

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Question 15

A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is required to reach the equivalence point, calculate the pH of the solution at the equivalence point.

Correct A. 7

B. 10

C. 14

D. 12

Correct Answer: A

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Question 16

Determine the s\tandard Gibbs free energy change (ΔG°) for the reaction: 2Ag+(aq) + 2Cl-(aq) → 2AgCl(s) at 25°C, given that the s\tandard enthalpy change (ΔH°) is -146.0 kJ/mol and the s\tandard entropy change (ΔS°) is -173.0 J/mol·K.

A. -146.0 kJ/mol

B. -146.0 kJ/mol + 173.0 J/mol·K

C. -146.0 kJ/mol - 173.0 J/mol·K

Correct D. -146.0 kJ/mol + 173.0 kJ/mol·K

Correct Answer: D

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Question 17

A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in enough water to make 1.00 L of solution. What is the concentration of OH- ions in the solution?

Correct A. 0.500 M

B. 0.250 M

C. 1.00 M

D. 2.00 M

Correct Answer: A

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Question 18

The reaction of 2.00 g of H2 with 3.00 g of O2 produces 4.00 g of H2O. What is the limiting reac\tant?

A. H2

Correct B. O2

C. H2O

D. Neither H2 nor O2 is the limiting reac\tant.

Correct Answer: B

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Question 19

A 1.00 M solution of HCl is prepared by dissolving 36.5 g of HCl in enough water to make 1.00 L of solution. What is the concentration of H+ ions in the solution?

Correct A. 1.00 M

B. 0.500 M

C. 2.00 M

D. 3.00 M

Correct Answer: A

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Question 20

A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in enough water to make 1.00 L of solution. What is the concentration of OH- ions in the solution?

Correct A. 0.500 M

B. 0.250 M

C. 1.00 M

D. 2.00 M

Correct Answer: A

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Question 21

Determine the number of unpaired electrons in the ground state of a neutral atom with atomic number 15.

A. 3

B. 5

Correct C. 7

D. 9

Correct Answer: C

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Question 22

A metal M reacts with chlorine gas to form a white solid product. The reaction is represented by the equation: M + Cl2 → MCl2. If 2.5 g of M reacts with 3.2 g of Cl2, what is the mass of the product formed?

A. 5.6 g

Correct B. 6.1 g

C. 6.8 g

D. 7.5 g

Correct Answer: B

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Question 23

A sample of a non-metallic element has a mass of 2.5 g and a volume of 5.0 cm3. Calculate the density of the element.

A. 0.5 g/cm3

B. 1.0 g/cm3

Correct C. 2.0 g/cm3

D. 5.0 g/cm3

Correct Answer: C

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Question 24

A 2.0 M solution of a strong acid is diluted to 1.0 M. What is the volume of the solution after dilution?

A. 1.0 L

Correct B. 2.0 L

C. 3.0 L

D. 4.0 L

Correct Answer: B

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Question 25

A metal M reacts with oxygen gas to form a brown solid product. The reaction is represented by the equation: 4M + 3O2 → 2M2O3. If 2.5 g of M reacts with 3.2 g of O2, what is the mass of the product formed?

A. 5.6 g

B. 6.1 g

Correct C. 6.8 g

D. 7.5 g

Correct Answer: C

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