POST UTME UI 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 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
A sample of a gas at 25°C and 1.00 atm is heated to 50°C at cons\tant pressure. What is the new volume of the gas?
A. 1.33 L
B. 1.67 L
C. 2.00 L
D. 2.33 L
Question 4
A 10% solution of NaOH is prepared by dissolving 10 g of NaOH in 90 g of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 5
A metal rod with a length of 20.0 cm and a cross-sectional area of 1.00 cm^2 is subjected to a tensile force of 100 N. What is the stress on the rod?
A. 5.00 x 10^6 Pa
B. 1.00 x 10^7 Pa
C. 2.00 x 10^7 Pa
D. 5.00 x 10^7 Pa
Question 6
A 2.0 L flask contains 1.0 atm of O2 at 298 K. What is the partial pressure of O2 in the flask?
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 7
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 8
A 50.0 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 25.0 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 9
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 10
A 2.5 M solution of HCl is prepared by dissolving 12.5 g of HCl in 500 mL of water. Calculate the molarity of the solution after 50 mL of water is added to it.
A. 1.25 M
B. 1.5 M
C. 1.75 M
D. 2.0 M
Question 11
A 100.0 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 35.0 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 12
A mixture of 0.5 mol of CO and 0.3 mol of H2 is heated to 500 K in a 1 L vessel. Assuming ideal gas behavior, calculate the partial pressure of CO.
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 13
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 14
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 15
A 100 mL sample of a solution containing 0.5 M NaCl is mixed with 100 mL of 0.5 M CaCl2. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

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