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POST UTME COVENANT UNIVERSITY 2021 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 2021 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of moles of carbon dioxide produced when 2.5 liters of carbon monoxide at 27°C and 1 atm is passed over heated copper(II) oxide.

A. 0.25 mol

B. 0.5 mol

Correct C. 1 mol

D. 1.25 mol

Correct Answer: C

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Question 2

A 2.5 M solution of sodium hydroxide is mixed with a 2.5 M solution of hydrochloric acid. What is the resulting concentration of the solution?

A. 2.5 M

Correct B. 5 M

C. 10 M

D. 0 M

Correct Answer: B

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Question 3

A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?

Correct A. To measure the volume of the solution

B. To measure the concentration of the solution

C. To mix the solutions

D. To filter the solution

Correct Answer: A

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Question 4

A 1.5 M solution of potassium hydroxide is mixed with a 1.5 M solution of sulfuric acid. What is the resulting concentration of the solution?

A. 1.5 M

Correct B. 3 M

C. 6 M

D. 0 M

Correct Answer: B

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Question 5

A diagram of a gas collection setup is shown below. What is the purpose of the gas syringe in this setup?

Correct A. To measure the volume of the gas

B. To measure the pressure of the gas

C. To mix the gases

D. To filter the gas

Correct Answer: A

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Question 6

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K, given that the initial concentrations of NO and O2 are 0.1 M and 0.05 M, respectively, and the rate of reaction is 3.2 × 10^\( -3 \) M/s.

A. \( 1.2 \times 10^3 \) L/mol·s

B. \( 2.4 \times 10^3 \) L/mol·s

Correct C. \( 3.2 \times 10^3 \) L/mol·s

D. \( 4.8 \times 10^3 \) L/mol·s

Correct Answer: C

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Question 7

A 2.5 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. The volume of CO2 produced is 1.2 L at 298 K and 1 atm. The volume of H2O produced is 0.8 L at 298 K and 1 atm. Calculate the empirical formula of the compound.

Correct A. C2H4

B. C3H6

C. C4H8

D. C5H10

Correct Answer: A

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Question 8

A 250 mL sample of a 0.1 M solution of NaOH is mixed with 250 mL of a 0.2 M solution of HCl. Calculate the pH of the resulting solution.

A. ( 1.3 )

Correct B. ( 2.3 )

C. ( 3.3 )

D. ( 4.3 )

Correct Answer: B

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Question 9

A 1.0 L sample of a 0.5 M solution of CaCl2 is mixed with 1.0 L of a 0.5 M solution of Na2SO4. Calculate the concentration of Ca2+ ions in the resulting solution.

A. ( 0.25 ) M

B. ( 0.5 ) M

Correct C. ( 0.75 ) M

D. ( 1.0 ) M

Correct Answer: C

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Question 10

A 2.0 g sample of a compound containing only carbon and oxygen is analyzed by combustion. The volume of CO2 produced is 1.5 L at 298 K and 1 atm. The volume of H2O produced is 0.5 L at 298 K and 1 atm. Calculate the empirical formula of the compound.

A. CO

Correct B. C2O2

C. C3O3

D. C4O4

Correct Answer: B

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Question 11

A 25.0 cm3 sample of 0.100 M HCl is titrated with 0.150 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 50.0 cm3

B. 75.0 cm3

Correct C. 100 cm3

D. 125 cm3

Correct Answer: C

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Question 12

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical flask

D. Test tube

Correct Answer: A

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Question 13

A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MX2. If 2.50 g of M reacts with 1.00 g of Cl2, what is the percentage yield of MX2 if the molar mass of M is 50.0 g/mol and the molar mass of Cl2 is 70.9 g/mol?

A. 80.0%

Correct B. 85.0%

C. 90.0%

D. 95.0%

Correct Answer: B

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Question 14

The diagram below shows a redox reaction. Identify the oxidizing agent.

Correct A. Oxidizing agent

B. Reducing agent

C. Electrolyte

D. Cathode

Correct Answer: A

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Question 15

A 2.00 M solution of NaOH is titrated with a 1.00 M solution of HCl. If 25.0 cm3 of HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?

A. 1.00 M

Correct B. 1.25 M

C. 1.50 M

D. 1.75 M

Correct Answer: B

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Question 16

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is CaO(s) + CO2(g) → CaCO3(s).

Correct A. -1781.6 kJ/mol

B. -1781.6 kJ/mol

C. -1781.6 kJ/mol

D. -1781.6 kJ/mol

Correct Answer: A

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Question 17

A 0.250 M solution of HCl is titrated with 0.250 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 18

A sample of nitrogen gas is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 0.031 atm, what is the mole \fraction of nitrogen in the gas mixture?

Correct A. 0.969

B. 0.969

C. 0.969

D. 0.969

Correct Answer: A

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Question 19

A 2.50 g sample of a polymer is dissolved in 100 mL of a solvent. If the polymer has a molecular weight of 50,000 g/mol, what is the concentration of the polymer solution in g/L?

Correct A. 0.050 g/L

B. 0.050 g/L

C. 0.050 g/L

D. 0.050 g/L

Correct Answer: A

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Question 20

A 1.00 M solution of H2SO4 is titrated with 1.00 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 21

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.

Correct A. -1206.60 kJ/mol

B. -1206.60 kJ/mol

C. -1206.60 kJ/mol

D. -1206.60 kJ/mol

Correct Answer: A

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Question 22

A 0.500 M solution of NaOH is mixed with a 0.500 M solution of 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 23

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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Question 24

A 1.00 M solution of H2SO4 is mixed with a 1.00 M solution of NaOH. 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 25

A diagram of a gas law setup is shown below. What is the purpose of the manometer?

Correct A. To measure the pressure of the gas

B. To measure the volume of the gas

C. To measure the temperature of the gas

D. To measure the density of the gas

Correct Answer: A

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