POST UTME COAL CITY UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The atomic radius of an element is 100 pm. Calculate the volume of a \single atom of the element.
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
Question 2
A 0.5 M solution of FeCl3 is electrolyzed u\sing a platinum electrode. What is the mass of Fe deposited at the cathode after 2 hours if the current is 2.0 A?
A. 0.5 g
B. 1.0 g
C. 1.5 g
D. 2.0 g
Question 3
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 4
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
Question 5
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
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 6
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 7
A solution of 0.5 M NaOH is mixed with a solution of 0.2 M HCl. What is the pH of the resulting solution?
A. 0.5
B. 1.0
C. 2.0
D. 3.0
Question 8
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 9
A 1.0 M solution of H2SO4 is titrated with a 1.0 M solution of NaOH. What is the pH of the resulting solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
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
B. 2
C. 3
D. 4
Question 11
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 12
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 13
A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MX2. If 2.5 g of M is reacted with 5.0 g of Cl2, what is the percentage yield of MX2 if the theoretical yield is 7.5 g?
A. 60%
B. 70%
C. 80%
D. 90%
Question 14
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
C. 0.4 M
D. 0.5 M
Question 15
A 0.5 M solution of a strong acid is titrated with 0.5 M NaOH. If 25 mL of the acid is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 12.5 mL
B. 25 mL
C. 50 mL
D. 100 mL

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