POST UTME ABU 2024 Chemistry | Objective

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Question 1
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 2
A 0.5 M solution of FeSO4 is electrolyzed u\sing a platinum electrode. If 50 mL of the solution is used and the current is 2.0 A, what is the mass of Fe deposited after 10 minutes?
A. 0.5 g
B. 1.0 g
C. 1.5 g
D. 2.0 g
Question 3
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 concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 4
The pH of a solution is a measure of its acidity or basicity. Which of the following solutions has a pH of 7?
A. 0.1 M HCl
B. 0.1 M NaOH
C. 0.1 M H2SO4
D. Distilled water
Question 5
The reaction between H_(2)O and CO is catalyzed by a platinum catalyst. The rate of reaction is given by the equation: rate = k[H_(2)O][CO]. If the rate of reaction is 0.05 mol/L/min and the concentration of CO is 0.1 M, calculate the rate cons\tant (k).
A. 0.5 min^\( -1 \)
B. 1.0 min^\( -1 \)
C. 2.0 min^\( -1 \)
D. 5.0 min^\( -1 \)
Question 6
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 7
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). Given that ΔH°(Al2O3) = -1675.7 kJ/mol, ΔH°(Fe2O3) = -824.2 kJ/mol, and ΔH°(Fe) = 0 kJ/mol.
A. -1352.4 kJ/mol
B. -1675.7 kJ/mol
C. -824.2 kJ/mol
D. 0 kJ/mol
Question 8
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 9
The atomic radius of an element decreases across a period in the periodic table due to the increase in the effective nuclear charge. However, the atomic radius of an element increases down a group in the periodic table due to the increase in the number of energy levels. Which of the following statements is NOT true?
A. The atomic radius of an element decreases across a period in the periodic table due to the increase in the effective nuclear charge.
B. The atomic radius of an element increases down a group in the periodic table due to the increase in the number of energy levels.
C. The atomic radius of an element decreases down a group in the periodic table due to the increase in the effective nuclear charge.
D. The atomic radius of an element increases across a period in the periodic table due to the increase in the number of energy levels.
Question 10
A metal M reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2MO3. If 2.5 g of M is reacted with 2.5 g of O2, what is the limiting reac\tant?
A. M
B. O2
C. MO3
D. Neither M nor O2 is the limiting reac\tant.
Question 11
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 12
A 2.0 M solution of H2SO4 is electrolyzed u\sing a platinum electrode. If the electrolysis is carried out for 2 hours, what is the mass of oxygen gas collected at the anode?
A. 0.5 g
B. 1.0 g
C. 1.5 g
D. 2.0 g
Question 13
A 50.0 mL sample of 0.200 M H2SO4 is titrated with 0.100 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 1
B. 2
C. 3
D. 4
Question 14
A 100.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 50.0 mL
B. 75.0 mL
C. 100.0 mL
D. 125.0 mL
Question 15
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

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