POST UTME UNILAG 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 2
A 100 mL sample of 0.1 M HCl is titrated with 1 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 1
B. 2
C. 3
D. 4
Question 3
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the concentration of H+ ions in the solution.
A. 0.1
B. 0.01
C. 0.001
D. 0.0001
Question 4
A sample of a metal is heated in a crucible. What is the expected outcome?
A. The metal is oxidized to its oxide form
B. The metal is reduced to its elemental form
C. The metal remains unchanged
D. The metal is converted to its ionic form
Question 5
A 1.0 M solution of a weak acid (HA) was mixed with a 1.0 M solution of a strong base (NaOH). The resulting solution had a pH of 4.5. What is the value of the acid dissociation cons\tant (Ka) for the weak acid?
A. \( 1.0 \times 10^{-4} \)
B. \( 1.0 \times 10^{-5} \)
C. \( 1.0 \times 10^{-6} \)
D. \( 1.0 \times 10^{-7} \)
Question 6
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the concentration of OH- ions in the solution.
A. 0.1
B. 0.01
C. 0.001
D. 0.0001
Question 7
A sample of a metal oxide is heated in a crucible. What is the expected outcome?
A. The metal oxide decomposes into its constituent elements
B. The metal oxide is reduced to its metal form
C. The metal oxide is oxidized to a higher oxidation state
D. The metal oxide remains unchanged
Question 8
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 9
The reaction of sulfur with oxygen gas produces sulfur dioxide gas. What is the balanced chemical equation for this reaction?
A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5
Question 10
In the electrolysis of a molten ionic compound, what is the primary function of the inert electrode?
A. To facilitate the transfer of ions to the electrode
B. To provide a path for the flow of electrons
C. To prevent the reaction from occurring
D. To increase the rate of reaction
Question 11
A 0.500 g sample of a polymer is dissolved in 100 mL of a solvent. What is the concentration of the solution?
A. 0.500 g/100 mL
B. 1.00 g/100 mL
C. 1.50 g/100 mL
D. 2.00 g/100 mL
Question 12
A sample of a non-metallic element was heated in a stream of oxygen gas. The resulting product was a white solid that was soluble in water. What is the identity of the non-metallic element?
A. Sulfur
B. Phosphorus
C. Chlorine
D. Bromine
Question 13
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution
Question 14
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. The pH of the solution at the equivalence point is 7. What is the pH of the solution at the half-equivalence point?
A. 6.0
B. 6.5
C. 7.0
D. 7.5
Question 15
Determine the structure of the compound formed by the reaction of 2-methylpropane with chlorine gas in the presence of light.
A. CH₃CH₂CH₂Cl
B. (CH₃)₃CCl
C. CH₃CH₂CH₂CH₂Cl
D. (CH₃)₂CHCH₂Cl

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