POST UTME COAL CITY UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
C. Mn
D. Cr
Question 2
The reaction of cyclohexane with bromine in the presence of light is an example of a ______________ reaction.
A. substitution reaction
B. elimination reaction
C. addition reaction
D. substitution-elimination reaction
Question 3
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -120 kJ/mol. What is the s\tandard Gibbs free energy change for the reaction NO(g) + 1/2O2(g) → NO2(g)?
A. -60 kJ/mol
B. -60 kJ/mol
C. -60 kJ/mol
D. -60 kJ/mol
Question 4
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 5
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
C. 4.5 L
D. 5.0 L
Question 6
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. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 7
A solution of 0.1 M NaOH is mixed with a solution of 0.05 M HCl. What is the concentration of the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 8
A solution contains 2.5 g of glu\cose (C6H12O6) dissolved in 100 mL of water. Calculate the molarity of the solution.
A. 0.0139 M
B. 0.014 M
C. 0.013 M
D. 0.0141 M
Question 9
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
C. 110 g/mol
D. 120 g/mol
Question 10
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
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
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
D. 0.5 M
Question 12
A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 13
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
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 14
A polymer has a molecular weight of 50,000 g/mol. Calculate the number of monomer units in the polymer.
A. 500
B. 1000
C. 2000
D. 5000
Question 15
A sample of 2.5 g of an unknown hydrocarbon is burned in a bomb calorimeter, and the heat released is 12.5 kJ. What is the molar mass of the hydrocarbon?
A. 50 g/mol
B. 100 g/mol
C. 150 g/mol
D. 200 g/mol

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