POST UTME AAUA 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The compound SO3 is classified as a(n) _______________________ oxide.
A. trioxide
B. oxide
C. sulfide
D. sulfate
Question 2
A 2.5 g sample of a non-metallic element is found to have a mass of 3.75 g after being heated in a crucible. What is the percentage increase in mass?
A. 25%
B. 50%
C. 75%
D. 100%
Question 3
A 2.5 g sample of a non-metallic element is found to have a mass of 3.75 g after being heated in a crucible. What is the percentage increase in mass?
A. 25%
B. 50%
C. 75%
D. 100%
Question 4
A 25 mL sample of a 0.5 M solution of NaOH is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 10 mL
B. 15 mL
C. 20 mL
D. 25 mL
Question 5
The atomic radius of an element is 100 pm. If the element is in the 4th period, what is the value of its atomic radius in the 5th period?
A. 125 pm
B. 150 pm
C. 175 pm
D. 200 pm
Question 6
A 2.5 g sample of a non-metallic element is found to have a mass of 3.75 g after being heated in a crucible. What is the percentage increase in mass?
A. 25%
B. 50%
C. 75%
D. 100%
Question 7
The compound SO2 is classified as a(n) _______________________ oxide.
A. dioxide
B. oxide
C. sulfide
D. sulfate
Question 8
The compound SO2 is classified as a(n) _______________________ oxide.
A. dioxide
B. oxide
C. sulfide
D. sulfate
Question 9
A 50 mL sample of a 0.2 M solution of H2SO4 is mixed with 50 mL of a 0.2 M solution of NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 10
A 2.5 M solution of HCl is prepared by dissolving 12.5 g of HCl in 2 L of water. What is the pH of the solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 11
The compound SO3 is classified as a(n) _______________________ oxide.
A. trioxide
B. oxide
C. sulfide
D. sulfate
Question 12
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the product Cu(s)?
A. +1
B. -1
C. 0
D. +2
Question 13
Calculate the concentration of a solution that contains 25 g of NaCl in 250 mL of water.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 2.5 g of NaOH in 100 mL of water. Calculate the concentration of hydroxide ions \( OH- \) in the solution.
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 15
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution

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