POST UTME LAUTECH 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 20 mL sample of 0.2 M NaOH is titrated with 0.2 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 2
A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the pH of the solution after 5 mL of NaOH has been added.
A. 1
B. 2
C. 3
D. 4
Question 3
A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.75 atm, what is the mole \fraction of CO2 in the gas mixture?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 4
A diagram of a titration apparatus is shown below. What is the purpose of the burette in the apparatus?
A. To measure the volume of the titrant.
B. To measure the volume of the analyte.
C. To mix the titrant and analyte.
D. To measure the pH of the solution.
Question 5
A diagram of a gas collection apparatus is shown below. What is the purpose of the gas collection tube in the apparatus?
A. To collect the gas produced.
B. To measure the volume of the gas produced.
C. To mix the gas with another gas.
D. To measure the pH of the solution.
Question 6
A 5.0L container is filled with 2.0mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.0atm
B. 1.5atm
C. 2.0atm
D. 2.5atm
Question 7
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 8
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 9
C. 11
D. 13
Question 9
A sample of N2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of N2 is 0.75 atm, what is the mole \fraction of N2 in the gas mixture?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 10
A sample of a non-metallic element is heated in a crucible. What is the expected change in the element's properties?
A. The element sublimes and its color changes.
B. The element melts and its color remains the same.
C. The element sublimes and its color remains the same.
D. The element melts and its color changes.
Question 11
Calculate the s\tandard enthalpy change for the combustion of 1 mole of propane (C3H8) at 298 K and 1 atm. The s\tandard enthalpy of formation of C3H8 is -103.8 kJ/mol, and the s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol.
A. -2220 kJ/mol
B. -1038 kJ/mol
C. 2220 kJ/mol
D. 1038 kJ/mol
Question 12
In the electrolysis of water, what is the primary product at the cathode?
A. O2
B. H2
C. OH-
D. H+
Question 13
A sample of an ideal gas is heated at cons\tant volume. Which of the following statements is true about the change in the gas's properties?
A. The gas expands and its pressure increases.
B. The gas contracts and its pressure decreases.
C. The gas expands and its pressure remains cons\tant.
D. The gas contracts and its pressure increases.
Question 14
What is the major difference between primary and secondary alcohols?
A. Primary alcohols have a higher boiling point than secondary alcohols
B. Secondary alcohols are more soluble in water than primary alcohols
C. Primary alcohols are more reactive than secondary alcohols
D. Secondary alcohols have a higher molecular weight than primary alcohols
Question 15
A 2.0 g sample of a compound is dissolved in 50 mL of water. The resulting solution has a concentration of 0.1 M. What is the molar mass of the compound?
A. 20 g/mol
B. 40 g/mol
C. 60 g/mol
D. 80 g/mol

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