POST UTME AFE BABALOLA UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.00 L flask contains 0.500 mol of a gas at 298 K. If the gas is heated to 373 K, what is the new volume of the gas?
A. 1.50 L
B. 2.00 L
C. 2.50 L
D. 3.00 L
Question 2
A 2.0 g sample of a non-metallic oxide is dissolved in 100 mL of water to form a solution with a pH of 4.5. If the molar mass of the oxide is 80 g/mol, what is the concentration of the solution in moles per liter?
A. 0.025 M
B. 0.025 mL
C. 0.25 M
D. 0.25 mL
Question 3
A 2.50 L flask contains 0.500 mol of an ideal gas at 298 K. 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 4
A solution of potassium dichromate (K2Cr2O7) is titrated with iron(II) sulfate (FeSO4) in the presence of dilute sulfuric acid (H2SO4). The reaction is as follows: K2Cr2O7 + 6FeSO4 + 7H2SO4 → K2SO4 + 3Cr2(SO4)3 + 6Fe2(SO4)3 + 7H2O. If 25.0 mL of 0.100 M K2Cr2O7 is titrated with 0.200 M FeSO4, what is the volume (in mL) of FeSO4 required to reach the equivalence point?
A. 12.5 mL
B. 25.0 mL
C. 37.5 mL
D. 50.0 mL
Question 5
A diagram of a gas apparatus is shown below. If the pressure of the gas is 2 atm and the volume is 100 mL, what is the temperature of the gas in Kelvin?
A. 300 K
B. 400 K
C. 500 K
D. 600 K
Question 6
A solution of sodium hydroxide (NaOH) is titrated with hydrochloric acid (HCl) in the presence of phenolphthalein as an indicator. The reaction is as follows: NaOH + HCl → NaCl + H2O. If 25.0 mL of 0.100 M NaOH is titrated with 0.200 M HCl, what is the pH of the solution at the equivalence point?
A. 7.00
B. 8.00
C. 9.00
D. 10.00
Question 7
A 0.500 M solution of NaCl is prepared by dissolving 25.0 g of NaCl in 1.00 L of water. What is the concentration of Cl- ions in the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 8
A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?
A. 1
B. 7
C. 10
D. 14
Question 9
A 1.0 M solution of a weak acid is titrated with 1.0 M NaOH. If 50 mL of the acid is required to reach the equivalence point, what is the pH of the solution at the equivalence point?
A. 7
B. 8
C. 9
D. 10
Question 10
A polymer is synthesized from a monomer with the following structure: CH2=CH-CH2-CH3. What is the expected molecular weight of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 11
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after mixing 50.0 mL of each solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 12
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 7
C. 10
D. 14
Question 13
The diagram below shows a simple black and white chemistry apparatus showing titration setup.
A. The burette contains the acid.
B. The beaker contains the acid.
C. The burette contains the base.
D. The beaker contains the base.
Question 14
Determine the molar mass of a polymer with the following repeating unit: CH2CH2OCH3. Assume that the polymer has a degree of polymerization of 100.
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 15
A 1.00 L flask contains 0.500 mol of a gas at 298 K. If the gas is heated to 373 K and compressed to 0.500 L, what is the new pressure of the gas?
A. 4.00 x 10^5 Pa
B. 5.00 x 10^5 Pa
C. 6.00 x 10^5 Pa
D. 7.00 x 10^5 Pa

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