POST UTME COAL CITY UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.5 M solution of sulfuric acid (H2SO4) is prepared by dissolving 9.5 g of the acid in water to make 100 mL of solution. What is the concentration of the solution in mol/L?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 2
The pH of a solution is 7.5. Calculate the concentration of hydrogen ions in moles per liter.
A. 1.0 \times 10^{-7} M
B. 1.0 \times 10^{-6} M
C. 1.0 \times 10^{-5} M
D. 1.0 \times 10^{-4} M
Question 3
Determine the number of moles of ΔH2O produced when 2.5 g of H2SO4 reacts with 3.0 g of NaOH in a reaction where the balanced equation is: H2SO4 + 2NaOH → Na2SO4 + 2H2O.
A. 0.05 mol
B. 0.10 mol
C. 0.15 mol
D. 0.20 mol
Question 4
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 100 g/mol
B. 200 g/mol
C. 50 g/mol
D. 25 g/mol
Question 5
A solution contains 0.1 M HCl and 0.3 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 6
A solution containing 0.05 M H2SO4 is titrated with 0.05 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 7
The pH of a solution is 4.5. Calculate the concentration of hydrogen ions in moles per liter.
A. 1.0 \times 10^{-5} M
B. 1.0 \times 10^{-4} M
C. 1.0 \times 10^{-3} M
D. 1.0 \times 10^{-2} M
Question 8
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. If 25 mL of each solution is used, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 9
A sample of sulfur dioxide gas is collected over water at 25°C and 1 atm. Calculate the partial pressure of sulfur dioxide gas, given that the total pressure is 1.5 atm.
A. 0.5 atm
B. 0.6 atm
C. 0.7 atm
D. 0.8 atm
Question 10
A polymer has a molecular weight of 40,000 g/mol and a degree of polymerization of 400. What is the molar mass of the repeating unit?
A. 100 g/mol
B. 200 g/mol
C. 50 g/mol
D. 25 g/mol
Question 11
A 25 mL sample of 0.5 M NaOH is added to 50 mL of 0.1 M HCl. What is the concentration of the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 12
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of water at 25°C and 1 atm, given that the cell potential is 1.23 V.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 13
A 0.5 M solution of H2SO4 is mixed with a 0.5 M solution of NaOH. If 25 mL of each solution is used, what is the concentration of the resulting solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 14
A 100 mL sample of 0.5 M HCl is added to 200 mL of 0.2 M NaOH. What is the concentration of the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 15
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. If 50 mL of each solution is used, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

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