POST UTME UNILORIN 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 2.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.25 M
B. 0.26 M
C. 0.27 M
D. 0.28 M
Question 2
Identify the type of chemical bond present in the molecule H2O.
A. ionic
B. covalent
C. metallic
D. hydrogen
Question 3
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 4
The reaction of nitrogen with oxygen produces nitrogen dioxide. What is the balanced chemical equation for this reaction?
A. N2 + O2 → 2NO
B. N2 + O2 → 2NO2
C. 2N2 + O2 → 2N2O
D. 2N2 + O2 → N2O2
Question 5
A 1.0 M solution of H2SO4 is titrated with 1.0 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 6
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 15.0 mL of NaOH?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 7
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 8
A solution contains 20 g of glu\cose (C6H12O6) dissolved in 100 g of water. Calculate the molality of the solution.
A. 0.5 m
B. 1.0 m
C. 1.5 m
D. 2.0 m
Question 9
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the molarity of the resulting solution?
A. 1.0 M
B. 1.1 M
C. 1.2 M
D. 1.3 M
Question 10
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 11
Determine the structure of the compound with molecular formula C5H12O.
A. \( CH_3CH_2CH_2CH_2CH_3 \)
B. \( CH_3CH_2CH_2CH_2OH \)
C. \( CH_3CH_2CH_2CH_2CH_2OH \)
D. \( CH_3CH_2CH_2CH_2CH_2CH_3 \)
Question 12
A 0.5 M solution of NaOH is prepared by dissolving 10 g of NaOH in 1 L of water. Calculate the pH of the solution.
A. 10
B. 11
C. 12
D. 13
Question 13
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Cl- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M
Question 14
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the unit of solubility?
A. g/L
B. mol/L
C. g/mol
D. L/mol
Question 15
A 2.0 M solution of NaOH is titrated with 1.0 M HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4

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