POST UTME IMS U 2025 Chemistry | Objective

Are you preparing for POST UTME IMS U 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.

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between sulfuric acid (H2SO4) and sodium hydroxide (NaOH) is a classic example of a neutralization reaction. What is the pH of the resulting solution?
Correct A. 7
B. 10
C. 14
D. 0

Correct Answer: A

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Question 2
A 2.5 M solution of hydrochloric acid (HCl) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution after 25 mL of NaOH has been added?
A. 3
Correct B. 7
C. 10
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 separate the titrant and analyte

Correct Answer: A

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Question 4
A 1.0 M solution of acetic acid (CH3COOH) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution after 20 mL of NaOH has been added?
A. 4
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 5
A diagram of a chemical apparatus setup is shown below. What is the purpose of the beaker in this setup?
Correct A. To mix the titrant and analyte
B. To separate the titrant and analyte
C. To measure the volume of the titrant
D. To measure the volume of the analyte

Correct Answer: A

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Question 6
The reaction of nitrogen dioxide with water produces nitric acid and nitric oxide. Write the balanced chemical equation for this reaction, including the states of all reac\tants and products.
Correct A. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{NO}(g)
B. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{NO}_2(g)
C. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{O}_2(g)
D. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{H}_2(g)

Correct Answer: A

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Question 7
A sample of oxygen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 298 K. Calculate the number of moles of oxygen gas present in the sample.
A. 0.02 mol
Correct B. 0.05 mol
C. 0.10 mol
D. 0.20 mol

Correct Answer: B

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Question 8
The element sulfur exists in several allotropic forms, including rhombic sulfur and monoclinic sulfur. Which of the following statements is true about the properties of these two allotropes?
A. Rhombic sulfur is more soluble in water than monoclinic sulfur.
B. Monoclinic sulfur is more reactive than rhombic sulfur.
Correct C. Rhombic sulfur has a higher melting point than monoclinic sulfur.
D. Monoclinic sulfur is more stable than rhombic sulfur.

Correct Answer: C

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Question 9
The periodic table is arranged in a way that elements with similar properties are placed in the same group. Which of the following elements is a member of group 17?
A. Chlorine
B. Bromine
Correct C. Fluorine
D. Iodine

Correct Answer: C

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Question 10
The reaction of sodium hydroxide with hydrochloric acid produces sodium chloride and water. Write the balanced chemical equation for this reaction, including the states of all reac\tants and products.
Correct A. \text{NaOH}(aq) + \text{HCl}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(l)
B. \text{NaOH}(aq) + \text{HCl}(aq) \rightarrow \text{NaCl}(l) + \text{H}_2\text{O}(g)
C. \text{NaOH}(aq) + \text{HCl}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(g)
D. \text{NaOH}(l) + \text{HCl}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(l)

Correct Answer: A

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Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mol of C(s) at 298 K.
A. -393.5 kJ/mol
Correct B. -393.5 kJ/mol + 393.5 kJ/mol
C. -393.5 kJ/mol + 298 kJ/mol
D. -393.5 kJ/mol - 298 kJ/mol

Correct Answer: B

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Question 12
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 13
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will be left after 10 years?
A. 50 g
B. 25 g
Correct C. 12.5 g
D. 6.25 g

Correct Answer: C

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Question 14
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?
Correct A. 0.2 M
B. 0.1 M
C. 0.05 M
D. 0.01 M

Correct Answer: A

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Question 15
A 1 M solution of H2SO4 is mixed with a 1 M solution of NaOH. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 16
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the concentration of H+ ions in the resulting solution?
Correct A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.001 M

Correct Answer: A

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Question 17
A 1 M solution of NaOH is mixed with a 1 M solution of HCl. What is the concentration of OH- ions in the resulting solution?
Correct A. 1 M
B. 0.5 M
C. 0.1 M
D. 0.01 M

Correct Answer: A

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Question 18
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the concentration of H+ ions in the resulting solution?
Correct A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.001 M

Correct Answer: A

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Question 19
A 1 M solution of NaOH is mixed with a 1 M solution of HCl. What is the concentration of OH- ions in the resulting solution?
Correct A. 1 M
B. 0.5 M
C. 0.1 M
D. 0.01 M

Correct Answer: A

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Question 20
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the concentration of H+ ions in the resulting solution?
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.001 M

Correct Answer: VIEW ANSWER

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Question 21
A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas.
A. 2.5 atm
B. 1.2 atm
Correct C. 0.6 atm
D. 1.5 atm

Correct Answer: C

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Question 22
A solution containing 10 g of NaCl is added to 100 mL of water. What is the concentration of the solution in g/L?
A. 10 g/L
Correct B. 20 g/L
C. 30 g/L
D. 40 g/L

Correct Answer: B

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Question 23
A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas.
A. 2.5 atm
B. 1.2 atm
Correct C. 0.6 atm
D. 1.5 atm

Correct Answer: C

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Question 24
A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas.
A. 2.5 atm
B. 1.2 atm
Correct C. 0.6 atm
D. 1.5 atm

Correct Answer: C

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Question 25
A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas.
A. 2.5 atm
B. 1.2 atm
Correct C. 0.6 atm
D. 1.5 atm

Correct Answer: C

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