Practice Post UTME COAL CITY UNIVERSITY chemistry 2025 Past Questions

Question 1

A 0.5 M solution of HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?

A. 100 mL

B. 200 mL

C. 400 mL

Correct D. 800 mL

Correct Answer: D

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Question 2

A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.5 atm, what is the mole \fraction of CO2 in the gas mixture?

Correct A. 0.5

B. 0.6

C. 0.7

D. 0.8

Correct Answer: A

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Question 3

A diagram of a titration setup is shown below. If the burette contains 0.1 M NaOH and the equivalence point is reached at 25 mL, what is the concentration of the HCl solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

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Question 4

A sample of a metal oxide is heated in a Bunsen burner flame. If the flame color is green, what is the likely metal present in the oxide?

A. Cu

B. Fe

Correct C. Mn

D. Cr

Correct Answer: C

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Question 5

A diagram of a gas collection apparatus is shown below. If the pressure of the gas is 1 atm and the temperature is 25°C, what is the volume of the gas in liters?

Correct A. 1 L

B. 2 L

C. 4 L

D. 8 L

Correct Answer: A

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Question 6

A polymer is formed by the condensation reaction of two monomers, A and B. The molecular weight of the polymer is 500 g/mol. If the molecular weight of monomer A is 100 g/mol and the molecular weight of monomer B is 200 g/mol, what is the average molecular weight of the repeating unit of the polymer?

A. 150 g/mol

B. 200 g/mol

Correct C. 250 g/mol

D. 300 g/mol

Correct Answer: C

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Question 7

A solution of NaCl is prepared by dissolving 10 g of NaCl in 100 g of water. If the density of the solution is 1.2 g/mL, what is the molarity 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 8

A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.5 atm, what is the mole \fraction of CO2 in the gas mixture?

A. 0.2

B. 0.3

C. 0.4

Correct D. 0.5

Correct Answer: D

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Question 9

A 10 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. If the equivalence point is reached at 20 mL, what is the concentration of the acid in the original solution?

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 10

A 50 mL sample of a solution containing 0.2 M H2SO4 is mixed with 50 mL of a solution containing 0.1 M NaOH. What is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 11

A reaction is carried out at cons\tant pressure, and the heat evolved is 120 kJ. If the reaction is repeated at cons\tant volume, and the heat evolved is 100 kJ, what is the change in entropy (ΔS) for the reaction?

A. 10 kJ/K

B. 20 kJ/K

Correct C. 30 kJ/K

D. 40 kJ/K

Correct Answer: C

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Question 12

The reaction of 2.0 g of an alkanol with 1.0 g of a strong acid produces 1.2 g of an ester. If the molar mass of the alkanol is 60 g/mol, what is the molar mass of the ester?

A. 90 g/mol

B. 100 g/mol

Correct C. 110 g/mol

D. 120 g/mol

Correct Answer: C

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Question 13

A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased to 300 K, what is the new volume of the gas?

A. 3.5 L

B. 4.0 L

Correct C. 4.5 L

D. 5.0 L

Correct Answer: C

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Question 14

A solution contains 10 g of a solute in 100 g of water. If 20 g of the solute is added, what is the new 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 15

A reaction is carried out at cons\tant pressure, and the heat evolved is 120 kJ. If the reaction is repeated at cons\tant volume, and the heat evolved is 100 kJ, what is the change in enthalpy (ΔH) for the reaction?

A. 20 kJ

B. 30 kJ

Correct C. 40 kJ

D. 50 kJ

Correct Answer: C

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Question 16

The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?

A. 0.01 M

Correct B. 0.02 M

C. 0.03 M

D. 0.04 M

Correct Answer: B

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Question 17

A sample of 2.5 g of a polymer is dissolved in 100 mL of a solvent. If the density of the solution is 1.2 g/mL, what is the molarity of the solution?

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 18

The half-life of a radioactive subs\tance is 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?

A. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 19

A mixture of 2.0 g of NaCl and 1.5 g of KCl is dissolved in 100 mL of water. If the density of the solution is 1.1 g/mL, what is the molarity of the solution?

A. 0.2 M

B. 0.3 M

Correct C. 0.4 M

D. 0.5 M

Correct Answer: C

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Question 20

A sample of 3.0 g of a polymer is dissolved in 150 mL of a solvent. If the density of the solution is 1.3 g/mL, what is the molarity of the solution?

A. 0.2 M

B. 0.3 M

C. 0.4 M

Correct D. 0.5 M

Correct Answer: D

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Question 21

The solubility of a subs\tance in a solvent is influenced by the following factors, EXCEPT:

A. Temperature

B. Pressure

Correct C. Concentration of the solute

D. pH of the solvent

Correct Answer: C

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Question 22

A solution contains 2.5 g of glu\cose (C6H12O6) dissolved in 100 mL of water. Calculate the molarity of the solution.

Correct A. 0.0139 M

B. 0.014 M

C. 0.013 M

D. 0.0141 M

Correct Answer: A

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Question 23

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

Correct A. Burette

B. Conical flask

C. Pipette

D. Thermometer

Correct Answer: A

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Question 24

The atomic radius of an element is 100 pm. Calculate the volume of a \single atom of the element.

Correct A. 4.19 x 10^7 pm^3

B. 4.19 x 10^6 pm^3

C. 4.19 x 10^5 pm^3

D. 4.19 x 10^4 pm^3

Correct Answer: A

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Question 25

A polymer has a molecular weight of 50,000 g/mol. Calculate the number of monomer units in the polymer.

Correct A. 500

B. 1000

C. 2000

D. 5000

Correct Answer: A

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