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POST UTME ABU 2023 Chemistry | Objective

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Question 1

Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess oxygen.

A. 0.25 mol

B. 0.5 mol

Correct C. 1.0 mol

D. 1.25 mol

Correct Answer: C

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Question 2

A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?

A. 0

Correct B. 1

C. 7

D. 14

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 titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To add the titrant to the analyte

Correct Answer: A

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Question 4

A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting concentration of the solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 5

A diagram of a chemical apparatus is shown below. What is the purpose of the condenser in this setup?

Correct A. To cool the vapor

B. To heat the vapor

C. To mix the vapor and liquid

D. To separate the vapor and liquid

Correct Answer: A

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Question 6

A sample of an ideal gas at 25°C and 1 atm is compressed to half its original volume. What is the new pressure of the gas?

A. 0.5 atm

B. 1 atm

C. 2 atm

Correct D. 4 atm

Correct Answer: D

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Question 7

A solution contains 2.5 g of NaCl. If 10 mL of water is added to the solution, what is the concentration of the solution in g/L?

A. 0.25 g/L

B. 0.5 g/L

C. 1 g/L

Correct D. 2 g/L

Correct Answer: D

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Question 8

A 2.0 L flask contains 0.5 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?

A. 0.25 atm

Correct B. 0.5 atm

C. 1 atm

D. 2 atm

Correct Answer: B

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Question 9

A 1.0 L flask contains 0.2 mol of H2 at 25°C. What is the concentration of H2 in the flask?

Correct A. 0.2 M

B. 0.5 M

C. 1 M

D. 2 M

Correct Answer: A

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Question 10

A solution contains 5.0 g of NaOH. If 10 mL of water is added to the solution, what is the concentration of the solution in g/L?

A. 0.5 g/L

B. 1 g/L

C. 2 g/L

Correct D. 5 g/L

Correct Answer: D

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Question 11

The reaction of potassium permanganate with hydrogen peroxide in acidic medium is a classic example of a redox reaction. Write the balanced chemical equation for this reaction.

Correct A. \text{KMnO}_4 + \text{H}_2\text{O}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{MnSO}_4 + \text{H}_2\text{O} + \text{O}_2

B. \text{KMnO}_4 + \text{H}_2\text{O}_2 \rightarrow \text{MnO}_2 + \text{H}_2\text{O}

C. \text{KMnO}_4 + \text{H}_2\text{SO}_4 \rightarrow \text{MnSO}_4 + \text{K}_2\text{SO}_4

D. \text{KMnO}_4 + \text{H}_2\text{O}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{MnSO}_4 + \text{H}_2\text{O} + \text{O}_2 + \text{K}_2\text{SO}_4

Correct Answer: A

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Question 12

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

Correct A. Burette

B. Beaker

C. Conical Flask

D. Pipette

Correct Answer: A

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Question 13

The rate cons\tant of a first-order reaction is 0.05 min^-1. Calculate the half-life of the reaction.

Correct A. 13.86 min

B. 14.14 min

C. 14.32 min

D. 14.50 min

Correct Answer: A

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Question 14

The following diagram shows a polymer chain. Identify the type of polymer.

Correct A. Polyethylene

B. Polypropylene

C. Polyvinyl Chloride

D. Polyester

Correct Answer: A

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Question 15

The following equation represents a chemical equilibrium. Write the equilibrium cons\tant expression.

Correct A. K = \\frac{[\\text{CaO}][\\text{CO}_2]}{[\\text{CaCO}_3]}

B. K = \\frac{[\\text{CaCO}_3]}{[\\text{CaO}][\\text{CO}_2]}

C. K = \\frac{[\\text{CaO}]}{[\\text{CaCO}_3][\\text{CO}_2]}

D. K = \\frac{[\\text{CO}_2]}{[\\text{CaO}][\\text{CaCO}_3]}

Correct Answer: A

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Question 16

The following diagram shows a periodic table. Identify the group number of the element with atomic number 12.

A. Group 1

Correct B. Group 2

C. Group 13

D. Group 14

Correct Answer: B

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Question 17

The following equation represents a redox reaction. Identify the oxidizing agent.

A. \text{Cu}(s)

Correct B. \text{AgNO}_3(aq)

C. \text{Cu\( NO}_3 \)_2(aq)

D. \text{Ag}(s)

Correct Answer: B

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Question 18

The reaction between sulfur dioxide and oxygen to form sulfur trioxide is a classic example of a redox reaction. Write the balanced chemical equation for this reaction, including the correct coefficients and state symbols.

A. \text{SO}_2 + \text{O}_2 \rightarrow \text{SO}_3

Correct B. \text{SO}_2 + \frac{1}{2}\text{O}_2 \rightarrow \text{SO}_3

C. \text{SO}_2 + \text{O}_2 \rightarrow \text{SO}_4

D. \text{SO}_2 + \frac{1}{2}\text{O}_2 \rightarrow \text{SO}_4

Correct Answer: B

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Question 19

A 2.5 L sample of a gas at 27°C and 1 atm is collected over water. If the vapor pressure of water at 27°C is 27.3 mmHg, calculate the partial pressure of the gas.

Correct A. 1.2 atm

B. 1.5 atm

C. 1.8 atm

D. 2.1 atm

Correct Answer: A

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Question 20

The boiling point of a solution containing 10 g of glu\cose (C6H12O6) in 100 g of water is 102.5°C. Calculate the molality of the solution.

A. 0.5 m

Correct B. 0.7 m

C. 0.9 m

D. 1.1 m

Correct Answer: B

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Question 21

A 25 mL sample of a 0.5 M solution of sodium hydroxide (NaOH) is titrated with a 1 M solution of hydrochloric acid (HCl). Calculate the number of moles of HCl required to neutralize the NaOH.

Correct A. 0.0125 mol

B. 0.015 mol

C. 0.0175 mol

D. 0.02 mol

Correct Answer: A

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Question 22

A 50 mL sample of a 0.2 M solution of potassium permanganate (KMnO4) is mixed with a 50 mL sample of a 0.1 M solution of sodium oxalate (Na2C2O4). Calculate the concentration of the resulting solution.

A. 0.05 M

Correct B. 0.07 M

C. 0.09 M

D. 0.11 M

Correct Answer: B

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Question 23

A 100 mL sample of a 0.5 M solution of sodium chloride (NaCl) is diluted to 500 mL. Calculate the new concentration of the solution.

Correct A. 0.05 M

B. 0.07 M

C. 0.09 M

D. 0.11 M

Correct Answer: A

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Question 24

A 50 mL sample of a 0.2 M solution of calcium chloride (CaCl2) is mixed with a 50 mL sample of a 0.1 M solution of sodium hydroxide (NaOH). Calculate the concentration of the resulting solution.

A. 0.05 M

Correct B. 0.07 M

C. 0.09 M

D. 0.11 M

Correct Answer: B

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Question 25

A 100 mL sample of a 0.5 M solution of potassium nitrate (KNO3) is diluted to 500 mL. Calculate the new concentration of the solution.

A. 0.05 M

B. 0.07 M

C. 0.09 M

D. 0.11 M

Correct Answer: VIEW ANSWER

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