POST UTME UI 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution containing 0.100 M NaOH is mixed with a solution containing 0.0500 M HCl. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 2
A 2.5 M solution of HCl is prepared by dissolving 12.5 g of HCl in 100 mL of water. Calculate the pH of this solution.
A. 0.5
B. 1
C. 2
D. 3
Question 3
Determine the molar mass of a polymer with the following composition: 30% polyethylene (C2H4), 40% polypropylene (C3H6), and 30% polystyrene (C8H8).
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 4
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the solution is 7.00 after the addition of 15.0 mL of NaOH, what is the concentration of the NaOH solution?
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 5
A 25.0 mL sample of a 0.100 M solution of NaOH is mixed with a 25.0 mL sample of a 0.0500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A 0.1 M solution of HCl is prepared by dissolving 3.0 g of HCl in 1.0 L of water. What is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 7
A 2.0 g sample of a metal is dissolved in 50 mL of 1 M HCl. The resulting solution is then titrated with 0.1 M NaOH. If the volume of NaOH required to reach the equivalence point is 20 mL, what is the molar mass of the metal?
A. 50 g/mol
B. 100 g/mol
C. 150 g/mol
D. 200 g/mol
Question 8
A 0.1 M solution of NaOH is prepared by dissolving 2.5 g of NaOH in 100 mL of water. Calculate the number of moles of NaOH that will be present in 10 mL of this solution.
A. 0.0025 mol
B. 0.005 mol
C. 0.01 mol
D. 0.02 mol
Question 9
Determine the number of moles of ΔHg in 250 mL of a 0.5 M solution of Hg(NO3)2.
A. 0.25 mol
B. 0.5 mol
C. 1.0 mol
D. 1.25 mol
Question 10
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^5 Pa
B. 2.02 x 10^5 Pa
C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa
Question 11
A 1.00 g sample of a metal is heated in a crucible until it decomposes completely. The mass of the metal obtained is 0.750 g. What is the empirical formula of the metal?
A. Mg
B. Ca
C. Fe
D. Cu
Question 12
A 2.0 g sample of a metal is heated in a crucible until it melts. The resulting liquid is then poured into a mold and allowed to cool. If the resulting solid has a volume of 5.0 mL, what is its density?
A. 5.0 g/mL
B. 10.0 g/mL
C. 15.0 g/mL
D. 20.0 g/mL
Question 13
A sample of a polymer has a molecular weight of 50,000 g/mol. If 0.5 g of the polymer is dissolved in 100 mL of solvent, calculate the concentration of the solution in g/L.
A. 0.1 g/L
B. 0.5 g/L
C. 1.0 g/L
D. 5.0 g/L
Question 14
A 2.5 L flask contains 0.5 mol of CO2 at 25°C. Calculate the partial pressure of CO2 in the flask.
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 15
A 100 mL sample of a solution containing 0.5 M NaOH is mixed with 100 mL of 0.5 M HCl. What is the resulting pH?
A. 0
B. 1
C. 2
D. 7

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