POST UTME ABU 2024 Chemistry | Objective

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Question 1
A solution of HCl is added to a solution of NaOH. The resulting solution is a salt and water. What is the chemical equation for this reaction?
A. HCl + NaOH → NaCl + H2O
B. HCl + NaOH → NaCl + H2
C. HCl + NaOH → Na2Cl + H2O
D. HCl + NaOH → NaCl + O2
Question 2
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 3
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of monomer A?
A. 80,000 g/mol
B. 100,000 g/mol
C. 120,000 g/mol
D. 140,000 g/mol
Question 4
A metal M has a density of 8.5 g/cm³ and a molar mass of 120 g/mol. If 2.5 g of M is dissolved in 100 mL of water, what is the concentration of the resulting solution in mol/L?
A. 0.02 M
B. 0.04 M
C. 0.06 M
D. 0.08 M
Question 5
A 2.5 M solution of H_(2)SO_(4) is prepared by dissolving 2.5 g of H_(2)SO_(4) in 100 mL of water. Calculate the molarity of the solution.
A. 1.25 M
B. 2.5 M
C. 5.0 M
D. 10.0 M
Question 6
A 1 L solution contains 0.1 M HCl and 0.1 M NaOH. The pH of the solution is 7. What is the concentration of the chloride ion in the solution?
A. 0.01 M
B. 0.1 M
C. 0.5 M
D. 1 M
Question 7
A 0.5 M solution of NaOH is prepared by dissolving 20.0 g of NaOH in 1000 mL of water. What is the concentration of the resulting solution in mol/L?
A. 0.05 M
B. 0.1 M
C. 0.5 M
D. 1.0 M
Question 8
A 2.5 M solution of HCl is mixed with a 2.5 M solution of NaOH. What is the resulting pH of the solution?
A. 7
B. 8
C. 9
D. 10
Question 9
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 10
The boiling point of a subs\tance is the temperature at which the vapor pressure of the subs\tance equals the surrounding pressure. Which of the following subs\tances has the highest boiling point?
A. Water
B. Ethanol
C. Methanol
D. Acetone
Question 11
A 0.5 M solution of KMnO4 in 1 M H2SO4 is used to oxidize an organic compound. The reaction is as follows: MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. If 25 mL of the solution is used to oxidize 1.5 g of the organic compound, and the initial concentration of MnO4- is 0.5 M, what is the concentration of Mn2+ after the reaction?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 12
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of the acid HA.
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M
Question 13
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. If 50 mL of each solution is used, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 14
A 1 L solution contains 0.1 M HCl and 0.1 M NaOH. The pH of the solution is 7. What is the concentration of the sodium ion in the solution?
A. 0.01 M
B. 0.1 M
C. 0.5 M
D. 1 M
Question 15
The reaction between sodium hydroxide and hydrochloric acid is a neutralization reaction. Write the balanced chemical equation for this reaction and identify the products formed.
A. NaOH + HCl → NaCl + H2O
B. NaOH + HCl → NaCl + H2O2
C. NaOH + HCl → NaCl + CO2
D. NaOH + HCl → NaCl + O2

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