POST UTME KSU 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the pH of the solution
C. To measure the temperature of the solution
D. To measure the density of the solution
Question 2
A solution of sulfuric acid (H2SO4) has a concentration of 1 M. If 10 mL of this solution is added to 100 mL of distilled water, what is the new concentration of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 3
A 2.5 L flask contains 0.5 mol of an ideal gas at 300 K. Calculate the work done when the gas expands to 5 L at cons\tant temperature.
A. -150 J
B. -300 J
C. -450 J
D. -600 J
Question 4
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. -74.8 kJ/mol
D. -283.5 kJ/mol
Question 5
A solution of HCl is prepared by dissolving 25.0 g of HCl in 100.0 mL of water. What is the concentration of the solution in molarity?
A. 1.25 M
B. 1.26 M
C. 1.27 M
D. 1.28 M
Question 6
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is: CaO(s) + CO2(g) → CaCO3(s).
A. -1207.6 kJ/mol
B. -1208.6 kJ/mol
C. -1209.6 kJ/mol
D. -1210.6 kJ/mol
Question 7
A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.5 g/L
C. 5 g/L
D. 50 g/L
Question 8
A metal (X) has an atomic number of 30. What is the number of electrons in the outermost energy level of X?
A. 2
B. 4
C. 6
D. 8
Question 9
A 2.00 M solution of NH3 is mixed with a 1.00 M solution of HCl. Calculate the pH of the resulting solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A 2.50 L flask contains 0.250 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 atm
B. 1.02 atm
C. 1.03 atm
D. 1.04 atm
Question 11
A solution contains 50.0 mL of 0.10 M sodium hydroxide (NaOH) and 50.0 mL of 0.20 M hydrochloric acid (HCl). What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 12
What is the pH of a solution that contains 0.10 M hydrofluoric acid (HF)?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 13
A 2.50 M solution of HCl is mixed with a 1.00 M solution of NaOH. Calculate the pH of the resulting solution.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 14
Determine the number of moles of carbon dioxide produced when 2.5 g of calcium carbonate is decomposed completely at cons\tant pressure.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 15
A diagram of the atomic structure of an atom is shown below. What is the name of the region around the nucleus where electrons are most likely to be found?
A. Nucleus
B. Electron Cloud
C. Protons
D. Neutrons

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