POST UTME BELLS UNIVERSITY 2024 Chemistry | Objective

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Question 1 View Details
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 2 View Details
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.025
Correct B. 0.05
C. 0.1
D. 0.2

Correct Answer: B

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Question 3 View Details
The diagram below shows a titration setup. Identify the part labeled A.
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 4 View Details
A polymer has a molecular weight of 100,000 g/mol. Calculate the number of monomer units in the polymer.
A. 100
B. 1000
C. 10,000
Correct D. 100,000

Correct Answer: D

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Question 5 View Details
The rate cons\tant (k) of a first-order reaction is 0.05 min^-1. Calculate the half-life of the reaction.
A. 10
Correct B. 20
C. 30
D. 40

Correct Answer: B

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Question 6 View Details
A 2.50 g sample of a polymer is dissolved in 25.0 mL of a solvent. If the density of the solution is 1.05 g/mL, calculate the molar mass of the polymer.
A. 500 g/mol
B. 1000 g/mol
Correct C. 2000 g/mol
D. 5000 g/mol

Correct Answer: C

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Question 7 View Details
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in 1.00 L of water. What is the concentration of OH- ions in the solution?
A. 0.500 M
Correct B. 0.250 M
C. 0.100 M
D. 0.0500 M

Correct Answer: B

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Question 8 View Details
A 2.00 L sample of a gas at 25.0°C and 1.00 atm is collected over water at 25.0°C. If the vapor pressure of water at 25.0°C is 23.8 torr, what is the partial pressure of the gas?
Correct A. 0.976 atm
B. 0.987 atm
C. 0.998 atm
D. 1.01 atm

Correct Answer: A

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Question 9 View Details
A 1.00 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. If the heat of combustion of the hydrocarbon is 42.0 kJ/g, what is the molar mass of the hydrocarbon?
A. 100 g/mol
B. 200 g/mol
Correct C. 300 g/mol
D. 400 g/mol

Correct Answer: C

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Question 10 View Details
A 0.500 M solution of HCl is prepared by dissolving 25.0 g of HCl in 1.00 L of water. What is the concentration of H+ ions in the solution?
A. 0.500 M
Correct B. 0.250 M
C. 0.100 M
D. 0.0500 M

Correct Answer: B

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Question 11 View Details
The element with atomic number 12 is classified as a metalloid. Which of the following elements has the same group number as this element?
A. Mg
Correct B. Si
C. Al
D. P

Correct Answer: B

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Question 12 View Details
The reaction of a strong acid with a weak base is an example of a reaction that produces a salt and water. Which of the following reactions is an example of this type of reaction?
Correct A. HCl + NaOH -> NaCl + H2O
B. H2SO4 + KOH -> K2SO4 + H2O
C. HNO3 + Ca(OH)2 -> Ca(NO3)2 + H2O
D. H3PO4 + NaOH -> Na3PO4 + H2O

Correct Answer: A

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Question 13 View Details
The s\tandard reduction potential of a half-cell is a measure of its t\endency to gain electrons. Which of the following half-cells has a negative s\tandard reduction potential?
A. Ag+/Ag
B. Cu2+/Cu
C. Fe3+/Fe
Correct D. Zn2+/Zn

Correct Answer: D

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Question 14 View Details
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
Correct D. 0.1 M NaCl

Correct Answer: D

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Question 15 View Details
The rate of a chemical reaction is influenced by several factors, including the concentration of the reac\tants. Which of the following factors would increase the rate of a reaction?
A. Increa\sing the temperature
B. Decrea\sing the concentration of the reac\tants
Correct C. Increa\sing the surface area of the reac\tants
D. U\sing a catalyst

Correct Answer: C

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Question 16 View Details
Determine the major product of the reaction between 2-methylpropene and HCl.
Correct A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylpropene
C. 2-chloro-2-methylbu\tane
D. 2-chloro-2-methylpen\tane

Correct Answer: A

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Question 17 View Details
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
Correct A. 7
B. 10
C. 12
D. 14

Correct Answer: A

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Question 18 View Details
A diagram of a titration setup is shown below. What is the purpose of the burette?
Correct A. To measure the volume of the solution
B. To measure the pH of the solution
C. To measure the temperature of the solution
D. To measure the density of the solution

Correct Answer: A

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Question 19 View Details
A diagram of a redox reaction is shown below. What is the oxidation state of the manganese ion?
A. +2
Correct B. +3
C. +4
D. +5

Correct Answer: B

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Question 20 View Details
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase?
Correct A. To separate the components of a mixture
B. To identify the components of a mixture
C. To measure the concentration of a solution
D. To measure the pH of a solution

Correct Answer: A

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Question 21 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of C(s) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
Correct D. -110.5 kJ/mol

Correct Answer: D

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Question 22 View Details
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. Calculate the s\tandard enthalpy of formation of N2(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
Correct D. 0 kJ/mol

Correct Answer: D

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Question 23 View Details
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
Correct D. 0 kJ/mol

Correct Answer: D

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Question 24 View Details
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C(s) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
Correct D. 0 kJ/mol

Correct Answer: D

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Question 25 View Details
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. Calculate the s\tandard enthalpy of formation of N2(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
Correct D. 0 kJ/mol

Correct Answer: D

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