POST UTME BOWEN UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide. If the mass of the metal oxide is 1.8 g, calculate the percentage yield of the metal oxide.
A. 80%
B. 90%
C. 95%
D. 98%
Question 2
A 2.5 M solution of HCl is mixed with a 1.5 M solution of NaOH. Calculate the pH of the resulting solution.
A. 2.50
B. 2.75
C. 3.00
D. 3.25
Question 3
A gas occupies a volume of 2 L at a pressure of 1 atm. If the temperature is increased to 300 K, what is the new volume?
A. 2.5 L
B. 3 L
C. 3.5 L
D. 4 L
Question 4
A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide. If the mass of the metal oxide is 2.0 g, calculate the percentage yield of the metal oxide.
A. 60%
B. 70%
C. 80%
D. 90%
Question 5
A metal has a density of 8 g/cm^3. If a 2 cm^3 sample has a mass of 16 g, what is the molar mass of the metal?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 6
The diagram below shows the structure of a cell. Identify the part labeled C.
A. Mitochondria
B. Nucleus
C. Cytoplasm
D. Lysosome
Question 7
A 1.0 M solution of HCl is titrated with 1.0 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, calculate the volume of HCl required to reach the equivalence point.
A. 50 mL
B. 75 mL
C. 100 mL
D. 125 mL
Question 8
A solution containing 0.1 M HCl and 0.1 M NaOH is mixed. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 9
A metal oxide has the formula MO2. If the molar mass of the metal (M) is 50 g/mol, what is the molar mass of the oxide?
A. 126 g/mol
B. 128 g/mol
C. 130 g/mol
D. 132 g/mol
Question 10
Determine the pH of a 0.1 M solution of HCl if 25 mL of 1 M NaOH is added to 50 mL of the HCl solution.
A. 1
B. 2
C. 3
D. 4
Question 11
A 0.1 M solution of FeCl3 is mixed with a 0.2 M solution of NaOH. Calculate the concentration of Fe(OH)3(s) formed.
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 12
The diagram below shows the structure of a molecule. Identify the type of bond between atoms A and B.
A. Sigma (σ) bond
B. Pi (π) bond
C. Sigma (σ) and Pi (π) bond
D. Hydrogen bond
Question 13
The rate cons\tant (k) of 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 14
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, ΔHf(C(s)) = 0 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.19 kJ/mol
C. -1206.79 kJ/mol
D. -1206.91 kJ/mol
Question 15
A solution contains 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

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