POST UTME ESUT 2022 Chemistry | Objective

Are you preparing for POST UTME ESUT exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of water at 25°C, where the cell potential is 1.23 V and the current is 0.5 A.
A. 0.25 mol
Correct B. 0.5 mol
C. 1 mol
D. 1.25 mol

Correct Answer: B

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Question 2
A 0.1 M solution of Fe2+ ions is mixed with a 0.1 M solution of SCN- ions. If the reaction is allowed to proceed to equilibrium, what is the concentration of FeSCN2+ ions?
A. 0.05 M
B. 0.1 M
Correct C. 0.15 M
D. 0.2 M

Correct Answer: C

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Question 3
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 4
A 0.1 M solution of CuSO4 is mixed with a 0.1 M solution of NaOH. If the reaction is allowed to proceed to equilibrium, what is the concentration of Cu(OH)2?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 5
A diagram of a cell is shown below. If the cell potential is 1.23 V and the current is 0.5 A, what is the number of moles of electrons transferred?
A. 0.25 mol
Correct B. 0.5 mol
C. 1 mol
D. 1.25 mol

Correct Answer: B

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Question 6
The rate cons\tant (k) of a first-order reaction is related to the half-life \( t_\( 1/2 \ \)) by the equation: k = ln(2) / t_\( 1/2 \). If the half-life of a reaction is 10 minutes, what is the rate cons\tant (k)?
Correct A. 0.0693 min^\( -1 \)
B. 0.693 min^\( -1 \)
C. 6.93 min^\( -1 \)
D. 69.3 min^\( -1 \)

Correct Answer: A

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Question 7
A sample of a gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas, assuming ideal behavior?
A. 0.5 L
B. 1 L
Correct C. 2 L
D. 4 L

Correct Answer: C

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Question 8
The reaction 2A + B → C + 2D is a second-order reaction with respect to A and first-order with respect to B. If the rate cons\tant (k) is 0.05 M^\( -1 \)s^\( -1 \) and the initial concentrations of A and B are 0.1 M and 0.05 M, respectively, what is the rate of reaction after 10 minutes?
A. 0.001 M/s
Correct B. 0.01 M/s
C. 0.1 M/s
D. 1 M/s

Correct Answer: B

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Question 9
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 10
A sample of a gas at 25°C and 1 atm is expanded to 0.5 atm. What is the new volume of the gas, assuming ideal behavior?
A. 0.5 L
Correct B. 1 L
C. 2 L
D. 4 L

Correct Answer: B

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Question 11
A sample of an ideal gas is heated at cons\tant volume. Which of the following statements is true about the change in entropy of the gas?
Correct A. The entropy of the gas increases.
B. The entropy of the gas decreases.
C. The entropy of the gas remains cons\tant.
D. The entropy of the gas becomes undefined.

Correct Answer: A

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Question 12
A solution contains 0.5 M NaCl and 0.2 M CaCl2. What is the total concentration of chloride ions in the solution?
Correct A. 0.7 M
B. 0.8 M
C. 0.9 M
D. 1.0 M

Correct Answer: A

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Question 13
A diagram of a titration apparatus is shown below. What is the purpose of the burette in the apparatus?
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 filter the solution.

Correct Answer: A

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Question 14
A sample of a subs\tance has a mass of 25 g and a volume of 10 mL. What is the density of the subs\tance?
Correct A. 2.5 g/mL
B. 2.0 g/mL
C. 1.5 g/mL
D. 1.0 g/mL

Correct Answer: A

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Question 15
A diagram of a simple harmonic motion is shown below. What is the amplitude of the motion?
Correct A. 2 cm
B. 3 cm
C. 4 cm
D. 5 cm

Correct Answer: A

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Question 16
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 17
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the solution after the addition of 25 mL of HCl?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 18
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.1
B. 1
C. 10
Correct D. 100

Correct Answer: D

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Question 19
A metal has a density of 8 g/cm^3. If a 2 cm^3 sample of the metal weighs 16 g, what is the volume of a 100 g sample of the metal?
A. 10
B. 20
C. 30
Correct D. 40

Correct Answer: D

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Question 20
A solution contains 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1
B. 1
Correct C. 10
D. 100

Correct Answer: C

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