POST UTME CALEB UNIVERSITY 2021 Chemistry | Objective

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Question 1
A 1.0 M solution of a weak base is prepared by dissolving 1.0 g of the base in 100 mL of water. Calculate the pOH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 2
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 3
A 0.1 M solution of a weak electrolyte is prepared by dissolving 0.1 g of the electrolyte in 100 mL of water. Calculate the number of moles of the electrolyte dissolved.
A. 0.001 mol
B. 0.01 mol
C. 0.1 mol
D. 1 mol
Question 4
A 2.50 L flask contains 0.500 mol of an ideal gas at 25°C. If the gas is heated to 125°C at cons\tant pressure, what is the new volume in L?
A. 3.00 L
B. 3.50 L
C. 4.00 L
D. 4.50 L
Question 5
A 2.00 M solution of HCl is mixed with a 2.00 M solution of NaOH. If 25.0 mL of HCl is added to 50.0 mL of NaOH, what is the concentration of the resulting solution?
A. 1.00 M
B. 1.50 M
C. 2.00 M
D. 2.50 M
Question 6
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. If 25.0 mL of H2SO4 is added to 50.0 mL of NaOH, what is the concentration of the resulting solution?
A. 1.00 M
B. 1.50 M
C. 2.00 M
D. 2.50 M
Question 7
A sample of $\text{H}_2$ gas occupies a volume of 3.00 L at a pressure of 0.500 atm. What is the volume of the gas at a pressure of 1.00 atm, assuming the temperature remains cons\tant?
A. 1.50 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 8
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) from the following equation: H2(g) + 1/2O2(g) → H2O(l).
A. 0 kJ/mol
B. -0.1 kJ/mol
C. -0.2 kJ/mol
D. -0.3 kJ/mol
Question 9
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 10
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CH4(g) from the following equation: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l).
A. -74.8 kJ/mol
B. -74.9 kJ/mol
C. -75.0 kJ/mol
D. -75.1 kJ/mol
Question 11
A solution of 0.100 M HCl is mixed with a solution of 0.100 M NaOH. If 25.0 mL of HCl is added to 50.0 mL of NaOH, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of C(s) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 13
A 0.1 M solution of NaOH is prepared by dissolving 2.5 g of NaOH in 100 mL of water. Calculate the pH of the solution after 10 mL of 1 M HCl is added to it.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 14
A sample of a gas occupies 2.50 L at 25°C and 1.00 atm. What is the pressure of the gas at 50°C and 3.00 atm?
A. 1.50 atm
B. 2.00 atm
C. 2.50 atm
D. 3.00 atm
Question 15
A polymer is formed from the reaction of 1,4-butadiene with sulfur dichloride (SCl2). The polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 250 g/mol
B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol

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