POST UTME NOUN 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of HCl is titrated with a 1.5 M solution of NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 2.5
B. 2.5
C. 2.5
D. 2.5
Question 2
A 0.1 M solution of a weak acid is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 8. What is the pKa of the acid?
A. 4.76
B. 5.76
C. 6.76
D. 7.76
Question 3
A solution contains 5.0 g of sodium hydroxide (NaOH) dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.50 M
B. 0.75 M
C. 1.00 M
D. 1.25 M
Question 4
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 5
A solution contains 25.0 g of NaCl. If the molar mass of NaCl is 58.44 g/mol, calculate the number of moles of NaCl in the solution.
A. 0.430 mol
B. 0.4305 mol
C. 0.431 mol
D. 0.432 mol
Question 6
A sample of a polymer has a molecular weight of 50000 g/mol. If the degree of polymerization is 200, what is the molar mass of the repeating unit?
A. 250
B. 500
C. 750
D. 1000
Question 7
A 0.1 M solution of a strong acid is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the pKa of the acid?
A. 4.76
B. 5.76
C. 6.76
D. 7.76
Question 8
A 5.00 g sample of a metal (M) is heated in a Bunsen burner flame and the following mass loss is observed: 2.50 g. What is the empirical formula of the metal oxide formed?
A. M2O3
B. MO
C. M2O
D. MO2
Question 9
A mixture of 0.5 mol of CO2 and 0.3 mol of O2 is heated to 500 K. Assuming ideal gas behavior, calculate the total pressure of the mixture u\sing the van der Waals equation.
A. 10.2 atm
B. 12.5 atm
C. 15.8 atm
D. 18.1 atm
Question 10
A solution of sodium hydroxide (NaOH) is prepared by dissolving 20.0 g of NaOH in 250 mL of water. What is the pOH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 11
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 200. Calculate the molar mass of the repeating unit.
A. 250 g/mol
B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol
Question 12
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
D. 4
Question 13
A 2.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 40.0 g of HCl in 250 mL of water. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 14
A mixture of 0.5 mol of CO2 and 0.3 mol of O2 is heated to 500 K. Assuming ideal gas behavior, calculate the total pressure of the mixture u\sing the ideal gas law.
A. 10.2 atm
B. 12.5 atm
C. 15.8 atm
D. 18.1 atm
Question 15
A 1.0 M solution of H2SO4 is titrated with a 1.0 M solution of NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 2
B. 2
C. 2
D. 2

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