POST UTME UI 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 L flask contains 0.100 mol of CO2 and 0.100 mol of H2O at 298 K. What is the partial pressure of CO2?
A. 0.500 atm
B. 0.750 atm
C. 0.900 atm
D. 1.00 atm
Question 2
The reaction between CH3OH(l) and HCl(g) is catalyzed by H2SO4(s). Write the balanced equation for the reaction.
A. CH3OH(l) + HCl(g) → CH3Cl(g) + H2O(l)
B. CH3OH(l) + HCl(g) → CH3Cl(g) + H2O(l)
C. CH3OH(l) + HCl(g) → CH3Cl(g) + H2O(l)
D. CH3OH(l) + HCl(g) → CH3Cl(g) + H2O(l)
Question 3
A 2.5 L sample of oxygen gas at 25°C and 1 atm is collected over water. What is the partial pressure of oxygen gas in the sample?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.25 atm
Question 4
Determine the pH of a 0.1 M solution of HCl after 25 mL of 0.1 M NaOH has been added to 25 mL of the HCl solution. The reaction is carried out in a 100 mL flask.
A. 1
B. 2
C. 3
D. 4
Question 5
A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl in 1.00 L of water. What is the concentration of the solution in molarity?
A. 1.00 M
B. 2.00 M
C. 3.00 M
D. 4.00 M
Question 6
A 2.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1.00 L of water. Calculate the molarity of the solution.
A. 2.00 M
B. 2.00 M
C. 2.00 M
D. 2.00 M
Question 7
A sample of nitrogen gas at 25°C and 1 atm is heated to 50°C. What is the new volume of the gas, assuming the pressure remains cons\tant?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 8
A 2.50 g sample of a compound containing only carbon and hydrogen is combusted in a bomb calorimeter. The heat of combustion is found to be - 37.3 kJ/g. Calculate the s\tandard enthalpy of formation of the compound.
A. -148.8 kJ/mol
B. -149.2 kJ/mol
C. -148.0 kJ/mol
D. -149.5 kJ/mol
Question 9
Determine the molar mass of a polymer with the following molecular formula: C10H8O4. Given that the molar mass of carbon is 12.01 g/mol, the molar mass of hydrogen is 1.008 g/mol, and the molar mass of oxygen is 16.00 g/mol.
A. 288.16 g/mol
B. 296.16 g/mol
C. 304.16 g/mol
D. 312.16 g/mol
Question 10
A 0.500 M solution of HCl is titrated with 0.500 M NaOH. Calculate the pH of the solution after 25.0 mL of NaOH has been added.
A. 2.00
B. 2.00
C. 2.00
D. 2.00
Question 11
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in 1.00 L of water. What is the concentration of the solution in molarity?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 12
A 100 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. The pH of the solution is measured at various points during the titration. Plot a pH vs. volume of NaOH added curve. What is the pH of the solution at the equivalence point?
A. 7
B. 9
C. 10
D. 12
Question 13
The atomic radius of an atom is defined as the dis\tance from the nucleus to the outermost electron in a neutral atom. Which of the following statements is NOT true about atomic radius?
A. Atomic radius decreases as the atomic number increases.
B. Atomic radius increases as the atomic number increases.
C. Atomic radius is the same for all isotopes of an element.
D. Atomic radius is the dis\tance from the nucleus to the outermost electron in a neutral atom.
Question 14
A 100 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. The pH of the solution is measured at various points during the titration. Plot a pH vs. volume of NaOH added curve. What is the pH of the solution at the equivalence point?
A. 7
B. 9
C. 10
D. 12
Question 15
A solution contains 0.100 M CaCl2 and 0.100 M Na2SO4. Calculate the concentration of Ca2+ ions after the solution has been diluted to 1.00 L.
A. 0.0500 M
B. 0.0500 M
C. 0.0500 M
D. 0.0500 M

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