POST UTME UNILORIN 2022 Chemistry | Objective

Are you preparing for POST UTME UNILORIN 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.

Practice these randomly selected questions to test your readiness.

Question 1
A solution of potassium dichromate (K2Cr2O7) in water is electrolyzed u\sing a platinum electrode. The electrolysis is carried out at a cons\tant current of 2 A for 2 hours. If the density of the solution is 1.2 g/mL, calculate the mass of chromium deposited at the cathode.
A. 0.5 g
Correct B. 1.0 g
C. 1.5 g
D. 2.0 g

Correct Answer: B

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Question 2
The following diagram shows the structure of a polymer chain. What is the type of polymer?
Correct A. Linear polymer
B. Branching polymer
C. Cross-linked polymer
D. Ring polymer

Correct Answer: A

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Question 3
A gas at 300 K and 1 atm is compressed to 2 atm. Calculate the final temperature of the gas.
A. 400 K
Correct B. 500 K
C. 600 K
D. 700 K

Correct Answer: B

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Question 4
The following diagram shows the structure of a colloid. What is the type of colloid?
Correct A. Suspension
B. Emulsion
C. Foam
D. Sol

Correct Answer: A

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Question 5
A solution of sodium chloride (NaCl) is electrolyzed u\sing a platinum electrode. The electrolysis is carried out at a cons\tant current of 1 A for 1 hour. If the density of the solution is 1.0 g/mL, calculate the mass of sodium deposited at the cathode.
A. 0.25 g
Correct B. 0.5 g
C. 0.75 g
D. 1.0 g

Correct Answer: B

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Question 6
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the resulting pH of the solution?
A. 7.0
Correct B. 10.0
C. 12.0
D. 14.0

Correct Answer: B

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Question 7
A reaction is represented by the equation: 2A + 3B → 2C + 3D. If 2 moles of A and 3 moles of B are present, what is the limiting reac\tant?
A. A
B. B
Correct C. Neither A nor B
D. Both A and B

Correct Answer: C

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Question 8
A sample of gas occupies 2.5 L at 25°C and 1 atm. What is the volume of the gas at 50°C and 2 atm?
A. 5.0 L
Correct B. 7.5 L
C. 10.0 L
D. 12.5 L

Correct Answer: B

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Question 9
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
Correct A. 7.0
B. 10.0
C. 12.0
D. 14.0

Correct Answer: A

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Question 10
A reaction is represented by the equation: 2A + 3B → 2C + 3D. If 2 moles of A and 3 moles of B are present, what is the limiting reac\tant?
A. A
B. B
Correct C. Neither A nor B
D. Both A and B

Correct Answer: C

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Question 11
The polymerization of styrene to polystyrene involves the addition of a monomer unit to the growing polymer chain. What is the type of polymerization reaction that occurs in this process?
A. Condensation polymerization
Correct B. Addition polymerization
C. Ring-opening polymerization
D. Step-growth polymerization

Correct Answer: B

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Question 12
A sample of a metal oxide is heated in a crucible. The oxide decomposes into a metal and oxygen gas. What is the type of reaction that occurs in this process?
Correct A. Decomposition reaction
B. Combustion reaction
C. Neutralization reaction
D. Oxidation reaction

Correct Answer: A

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Question 13
A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the type of reaction that occurs at the cathode?
Correct A. Reduction reaction
B. Oxidation reaction
C. Neutralization reaction
D. Combustion reaction

Correct Answer: A

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Question 14
A sample of a gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of the gas?
A. 1 atm
Correct B. 0.95 atm
C. 1.05 atm
D. 0.90 atm

Correct Answer: B

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Question 15
A solution of hydrogen peroxide is decomposed by a catalyst. What is the type of reaction that occurs in this process?
Correct A. Decomposition reaction
B. Combustion reaction
C. Neutralization reaction
D. Oxidation reaction

Correct Answer: A

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Question 16
Determine the pH of a 0.1 M solution of HCl at 25°C.
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 H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
Correct C. 37.5 mL
D. 50 mL

Correct Answer: C

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Question 18
The s\tandard electrode potential of the Zn2+/Zn couple is -0.76 V. Calculate the s\tandard electrode potential of the Cu2+/Cu couple if the cell potential for the reaction Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) is 1.10 V.
Correct A. -0.34 V
B. 0.34 V
C. 0.76 V
D. 1.10 V

Correct Answer: A

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Question 19
A solution contains 0.1 M NaCl and 0.1 M CaCl2. Calculate the molar conductivity of the solution at 25°C.
A. 0.01 S cm^2 mol^-1
Correct B. 0.02 S cm^2 mol^-1
C. 0.03 S cm^2 mol^-1
D. 0.04 S cm^2 mol^-1

Correct Answer: B

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Question 20
A 10 mL sample of 0.5 M HCl is mixed with 20 mL of 0.1 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 21
A 0.1 M solution of a monoprotic acid has a pH of 2. Determine the concentration of the acid if the pH is increased to 3 by the addition of 25 mL of 0.1 M NaOH.
Correct A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: A

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Question 22
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 25 mL of 0.1 M HCl is added to 100 mL of the solution?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 23
A 0.1 M solution of a salt of a strong acid and a weak base has a pH of 8. Determine the concentration of the salt.
A. 0.01 M
Correct B. 0.1 M
C. 1 M
D. 10 M

Correct Answer: B

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Question 24
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 25 mL of 0.1 M NaOH is added to 100 mL of the solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 25
A 0.1 M solution of a salt of a strong acid and a strong base has a pH of 7. Determine the concentration of the salt.
A. 0.01 M
Correct B. 0.1 M
C. 1 M
D. 10 M

Correct Answer: B

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