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 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
Question 2
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after the addition of 10 mL of 0.1 M HCl?
A. 1
B. 7
C. 10
D. 14
Question 3
The diagram below shows a 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 4
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). The reaction is as follows: NaOH + HCl → NaCl + H2O. If 25 mL of 0.1 M NaOH is titrated with 20 mL of 0.2 M HCl, what is the concentration of the remaining NaOH solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 5
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 6
A 1.0 M solution of a non-metallic oxide is titrated with a 1.0 M solution of a strong acid. If 20 mL of the acid is required to reach the equivalence point, what is the volume of the oxide solution in liters?
A. 0.02 L
B. 0.02 mL
C. 0.2 L
D. 0.2 mL
Question 7
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 8
A metal X reacts with chlorine gas to form a white solid. The reaction is: X + Cl2 → XCl2. If 2.5 g of X reacts with 1.5 g of Cl2, what is the molar mass of X?
A. 20
B. 30
C. 40
D. 50
Question 9
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 10
A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, what is the partial pressure of the nitrogen gas?
A. 0.95 atm
B. 0.98 atm
C. 1.02 atm
D. 1.05 atm
Question 11
Calculate the number of moles of O2 gas produced in the reaction: 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2O(l) + 3/2O2(g).
A. 0.5
B. 1
C. 1.5
D. 2
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
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 14
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 15
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

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