POST UTME OSUSTECH 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The element with atomic number 12 is _______.
A. Mg
B. Ca
C. Sr
D. Ba
Question 2
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If the initial pH of the acid solution is 1.0, what is the pH of the solution after the addition of 20 mL of 0.1 M NaOH?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
Question 3
Determine the number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaCO}_3$ is completely decomposed at 1000 K and 1 atm.
A. 0.0250 mol
B. 0.0500 mol
C. 0.100 mol
D. 0.200 mol
Question 4
Determine the s\tandard enthalpy of formation of ΔHₓSOₓ(ₓl) from the following data: ΔHₓf(ΔHₓO(ₓl)) = -285.8 kJ/mol, ΔHₓf(ₓS(ₓl)) = 0 kJ/mol, ΔHₓf(ₓHₓ(ₓl)) = 0 kJ/mol.
A. -296.8 kJ/mol
B. -286.8 kJ/mol
C. -286.8 kJ/mol
D. -296.8 kJ/mol
Question 5
A 2 M solution of H2SO4 is prepared by dissolving 2 mol of H2SO4 in 1 L of water. Calculate the concentration of the solution in g/L.
A. 100 g/L
B. 150 g/L
C. 200 g/L
D. 250 g/L
Question 6
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 100. What is the molar mass of the repeating unit of the polymer?
A. 500 g/mol
B. 5000 g/mol
C. 50000 g/mol
D. 500000 g/mol
Question 7
A 2 M solution of H2SO4 is prepared by dissolving 2 mol of H2SO4 in 1 L of water. Calculate the concentration of the solution in g/L.
A. 100 g/L
B. 150 g/L
C. 200 g/L
D. 250 g/L
Question 8
A sample of an ideal gas at 25°C and 1 atm undergoes a process where its temperature is doubled while its volume is halved. What is the final pressure of the gas in atm?
A. 2 atm
B. 4 atm
C. 8 atm
D. 16 atm
Question 9
A 0.1 M solution of a weak base B is titrated with 0.1 M HCl. If the initial pH of the base solution is 10.5, what is the pH of the solution after the addition of 20 mL of 0.1 M HCl?
A. 6.5
B. 7.5
C. 8.5
D. 9.5
Question 10
Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in ethanol.
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Condensation reaction
Question 11
A 0.1 M solution of NaOH is prepared by dissolving 0.1 mol of NaOH in 1 L of water. Calculate the concentration of the solution in g/L.
A. 2 g/L
B. 4 g/L
C. 6 g/L
D. 8 g/L
Question 12
What is the molar mass of a compound that contains 40.0% carbon, 6.67% hydrogen, and 53.33% oxygen by mass?
A. 60.0 g/mol
B. 80.0 g/mol
C. 100.0 g/mol
D. 120.0 g/mol
Question 13
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\text{NaOH}$ is required to neutralize 20.0 mL of a weak acid, what is the concentration of the acid?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 14
The following reaction occurs at 298 K: 2CH4(g) + 3O2(g) → 2CO2(g) + 4H2O(l). If ΔH = -2210 kJ/mol, what is the s\tandard enthalpy of formation of O2(g)?
A. 0 kJ/mol
B. 0 kJ/mol + 393.5 kJ/mol
C. 0 kJ/mol + 393.5 kJ/mol + 2\( 0 kJ/mol \)
D. 0 kJ/mol + 393.5 kJ/mol + 2\( 0 kJ/mol \) + 2\( 0 kJ/mol \)
Question 15
A 10.0 g sample of a compound is dissolved in 100.0 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 5.0 M

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