POST UTME SKYLINE UNIVERSITY 2021 Chemistry | Objective
Practice these randomly selected questions to test your readiness.
Question 1
A 50 mL sample of a 0.05 M solution of H2SO4 is titrated with a 0.1 M solution of NaOH. The pH of the solution after the titration is 7. Calculate the volume of NaOH added.
Question 2
A solution of 0.1 M NaCl is prepared by dissolving 0.1 mol of NaCl in 1 L of water. What is the concentration of Cl- ions in the solution?
Question 3
The rate cons\tant (k) for 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?
Question 4
A 25 mL sample of a 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. The pH of the solution after the titration is 7. Calculate the volume of HCl added.
Question 5
A sample of gas has a volume of 2 L at a pressure of 1 atm and a temperature of 300 K. What is the new volume of the gas if the pressure is doubled and the temperature is tripled?
Question 6
A solution of 0.1 M NaOH is prepared by dissolving 0.1 mol of NaOH in 1 L of water. What is the pH of the solution?
Question 7
A 100 mL sample of a 0.1 M solution of NH3 is titrated with a 0.1 M solution of HCl. The pH of the solution after the titration is 7. Calculate the volume of HCl added.
Question 8
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^-7.
Question 9
A 2.5 g sample of a polymer is dissolved in 100 mL of a solvent. The osmotic pressure of the solution is 1.5 atm at 25°C. Calculate the molar mass of the polymer.
Question 10
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
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