POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2018 Chemistry | Objective

Are you preparing for POST UTME JOSEPH AYO BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
In the electrolysis of molten sodium chloride, what is the primary product formed at the cathode?
Correct A. Sodium metal
B. Chlorine gas
C. Sodium chloride
D. Hydrogen gas

Correct Answer: A

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Question 2
What is the major difference between the periodic table of elements and the periodic table of atomic masses?
A. The periodic table of elements is arranged by atomic mass, while the periodic table of atomic masses is arranged by atomic number.
Correct B. The periodic table of elements is arranged by atomic number, while the periodic table of atomic masses is arranged by atomic mass.
C. The periodic table of elements is arranged by electron configuration, while the periodic table of atomic masses is arranged by atomic number.
D. The periodic table of elements is arranged by atomic mass, while the periodic table of atomic masses is arranged by electron configuration.

Correct Answer: B

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Question 3
A sample of water is contaminated with 10 ppm of lead. What is the concentration of lead in the water in mg/L?
Correct A. 0.1 mg/L
B. 1 mg/L
C. 10 mg/L
D. 100 mg/L

Correct Answer: A

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Question 4
What is the major advantage of u\sing a distillation column in the separation of a mixture of liquids?
Correct A. It allows for the separation of a mixture of liquids based on their boiling points.
B. It allows for the separation of a mixture of liquids based on their densities.
C. It allows for the separation of a mixture of liquids based on their molecular weights.
D. It allows for the separation of a mixture of liquids based on their solubilities.

Correct Answer: A

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Question 5
A 2.5 L sample of a solution containing 0.1 M NaCl is electrolyzed u\sing a platinum electrode. What is the mass of chlorine gas produced at the anode?
A. 0.05 g
Correct B. 0.1 g
C. 0.2 g
D. 0.5 g

Correct Answer: B

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Question 6
The molar mass of a compound is 180 g/mol. If 2.5 g of the compound is dissolved in 250 mL of water, what is the concentration of the solution in mol/L?
Correct A. 0.014 M
B. 0.028 M
C. 0.056 M
D. 0.112 M

Correct Answer: A

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Question 7
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm. What is the pressure of the gas if the volume is reduced to 1.2 L?
A. 1.5 atm
B. 2.5 atm
Correct C. 3.2 atm
D. 4.0 atm

Correct Answer: C

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Question 8
A solution contains 5.0 g of glu\cose (C6H12O6) per 100 mL of solution. What is the concentration of the solution in mol/L?
A. 0.028 M
Correct B. 0.056 M
C. 0.112 M
D. 0.224 M

Correct Answer: B

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Question 9
A 2.0 M solution of sodium hydroxide (NaOH) is prepared by dissolving 40 g of NaOH in 1 L of water. What is the molarity of the solution?
A. 1.0 M
Correct B. 2.0 M
C. 3.0 M
D. 4.0 M

Correct Answer: B

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Question 10
A 1.5 L sample of oxygen gas is collected over water at a temperature of 25°C and a pressure of 1.2 atm. What is the partial pressure of the oxygen gas?
Correct A. 1.0 atm
B. 1.1 atm
C. 1.2 atm
D. 1.3 atm

Correct Answer: A

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Question 11
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 12
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?
A. 2
Correct B. 3
C. 4
D. 5

Correct Answer: B

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Question 13
A 100.0 mL sample of 0.200 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 50.0 mL of NaOH?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 14
A 50.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of NaOH?
A. 2
Correct B. 3
C. 4
D. 5

Correct Answer: B

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Question 15
A 100.0 mL sample of 0.200 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 100.0 mL of NaOH?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 16
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the initial pH of the solution is 4.5, what is the pH after the addition of 20 mL of 0.1 M NaOH?
A. 4.5
Correct B. 5.5
C. 6.5
D. 7.5

Correct Answer: B

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Question 17
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1 mole of C6H12O6(s) at 298 K?
A. -2800 kJ/mol
B. -2900 kJ/mol
Correct C. -3000 kJ/mol
D. -3100 kJ/mol

Correct Answer: C

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Question 18
A 2.0 M solution of a strong acid HCl is mixed with a 2.0 M solution of a weak base NH3. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
Correct D. 4.0

Correct Answer: D

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Question 19
A 1.0 M solution of K2Cr2O7 is reduced by a 1.0 M solution of FeSO4. What is the ratio of the number of moles of Fe2+ produced to the number of moles of Cr3+ produced?
A. 1:1
B. 2:1
Correct C. 3:1
D. 4:1

Correct Answer: C

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Question 20
A 0.1 M solution of a weak base B(OH)3 is titrated with 0.1 M HCl. If the initial pH of the solution is 9.5, what is the pH after the addition of 20 mL of 0.1 M HCl?
A. 5.5
B. 6.5
Correct C. 7.5
D. 8.5

Correct Answer: C

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Question 21
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). Calculate the number of moles of copper metal deposited from a solution containing 2.5 g of CuSO4·5H2O.
A. 0.010 mol
Correct B. 0.020 mol
C. 0.030 mol
D. 0.040 mol

Correct Answer: B

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Question 22
A 0.500 M solution of HCl is prepared by dissolving 25.0 g of HCl in enough water to make 1.00 L of solution. Calculate the pH of the solution.
A. 0.5
Correct B. 1.0
C. 1.5
D. 2.0

Correct Answer: B

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Question 23
The diagram below shows a titration setup.
Correct A. The burette contains the acid.
B. The beaker contains the acid.
C. The burette contains the base.
D. The beaker contains the base.

Correct Answer: A

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Question 24
The reaction of sodium hydroxide with hydrochloric acid is represented by the equation: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l). Calculate the number of moles of sodium chloride formed when 2.50 g of NaOH is mixed with 2.50 g of HCl.
A. 0.050 mol
Correct B. 0.100 mol
C. 0.150 mol
D. 0.200 mol

Correct Answer: B

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Question 25
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in enough water to make 1.00 L of solution. Calculate the pH of the solution.
A. 0.5
Correct B. 1.0
C. 1.5
D. 2.0

Correct Answer: B

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