POST UTME CHRISTOPHER UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of a weak base B is titrated with 1.0 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the pOH of the resulting solution?
A. \( pOH = 1 \)
B. \( pOH = 2 \)
C. \( pOH = 3 \)
D. \( pOH = 4 \)
Question 2
A 1.0 g sample of a metal carbonate is heated to produce a metal oxide. If the mass of the metal oxide is 0.8 g, calculate the percentage of the metal in the metal carbonate.
A. 20%
B. 25%
C. 30%
D. 35%
Question 3
A metal M (atomic number 23) reacts with chlorine gas to form a compound MCl2. If the molar mass of MCl2 is 142.5 g/mol, what is the atomic mass of M?
A. \( 23.5 g/mol \)
B. \( 24.5 g/mol \)
C. \( 25.5 g/mol \)
D. \( 26.5 g/mol \)
Question 4
A solution contains 5.0 g of glu\cose (C6H12O6) per 100 mL. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 5
The diagram below shows a periodic table. Which element is located in period 3, group 16?
A. Sulfur
B. Selenium
C. Tellurium
D. Polonium
Question 6
A sample of an ideal gas at 25°C and 1 atm is heated to 100°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?
A. 1:1
B. 2:1
C. 3:1
D. 4:1
Question 7
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 20 mL of 0.1 M HCl is added to 100 mL of the solution?
A. \( pH = 1 \)
B. \( pH = 2 \)
C. \( pH = 3 \)
D. \( pH = 4 \)
Question 8
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. The pH of the solution at the equivalence point is 7. Calculate the initial volume of the NaOH solution required to reach the equivalence point.
A. 50 mL
B. 100 mL
C. 150 mL
D. 200 mL
Question 9
A 1.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1.0 L of water. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 10
A 2.0 g sample of an organic compound is dissolved in 50.0 mL of diethyl ether. The solution is then titrated with 0.1 M HCl. The equivalence point is reached at 25.0 mL of HCl. Determine the molar mass of the organic compound.
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 11
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To inhibit the reaction
Question 12
A 20.0 mL sample of a solution containing 0.10 M HCl is titrated with 0.10 M NaOH. What is the pH of the solution after the titration?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 13
What is the formula for the compound formed when sulfur reacts with oxygen?
A. SO2
B. SO3
C. SO4
D. SO5
Question 14
A 5.0 g sample of a subs\tance is burned in a bomb calorimeter. If the heat released is 1200 J/g, what is the enthalpy change for the combustion reaction?
A. 6000 J/mol
B. 8000 J/mol
C. 10000 J/mol
D. 12000 J/mol
Question 15
A 2.0 M solution of H2SO4 is prepared by dissolving 98.0 g of H2SO4 in 1.0 L of water. What is the concentration of the resulting solution?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M

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