POST UTME MOUNTAIN TOP UNIVERSITY 2024 Chemistry | Objective

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Question 1 View Details
A solution of 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution at the equivalence point?
Correct A. 7
B. 10
C. 14
D. 12

Correct Answer: A

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Question 2 View Details
A sample of 2.0 g of a polymer is dissolved in 100 mL of a solvent. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 3 View Details
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 0.5 L
B. 1 L
Correct C. 2 L
D. 4 L

Correct Answer: C

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Question 4 View Details
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution at the equivalence point?
Correct A. 7
B. 10
C. 14
D. 12

Correct Answer: A

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Question 5 View Details
A sample of 1.0 g of a polymer is dissolved in 50 mL of a solvent. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 6 View Details
Determine the bond order of the molecule O2 u\sing the molecular orbital diagram. Assume that the energy levels are given by the equation \( E_n = -\frac{13.6}{n^2} , \text{eV} \).
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 7 View Details
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 10.0 mL of NaOH has been added.
A. 2.00
Correct B. 2.50
C. 3.00
D. 3.50

Correct Answer: B

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Question 8 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6(s).
A. -2800 kJ
B. -2900 kJ
Correct C. -3000 kJ
D. -3100 kJ

Correct Answer: C

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Question 9 View Details
A 2.00 g sample of an unknown hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. Calculate the molar mass of the hydrocarbon.
A. 20.0 g/mol
B. 30.0 g/mol
Correct C. 40.0 g/mol
D. 50.0 g/mol

Correct Answer: C

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Question 10 View Details
A 1.00 M solution of NaOH is titrated with a 1.00 M solution of HCl. Calculate the pH of the solution after 25.0 mL of HCl has been added.
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 11 View Details
Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4), 20% polypropylene (C3H6), and 20% polystyrene (C8H8).
A. 60 g/mol
B. 120 g/mol
Correct C. 240 g/mol
D. 360 g/mol

Correct Answer: C

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Question 12 View Details
A metal oxide (M2O3) has a molar mass of 228 g/mol. If the metal has an atomic mass of 56 g/mol, what is the molar mass of the oxide ion \( O3- \)?
A. 48 g/mol
B. 96 g/mol
Correct C. 144 g/mol
D. 192 g/mol

Correct Answer: C

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Question 13 View Details
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 14 View Details
A sample of hydrocarbon (C4H10) has a density of 0.65 g/mL. What is the molar mass of the hydrocarbon?
A. 60 g/mol
B. 80 g/mol
Correct C. 100 g/mol
D. 120 g/mol

Correct Answer: C

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Question 15 View Details
A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.3 M
D. 0.4 M

Correct Answer: C

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Question 16 View Details
The electrolysis of a solution of copper(II) sulfate u\sing a copper electrode results in the formation of copper metal and oxygen gas. Write the half-equation for the reduction of copper(II) ions at the copper electrode.
A. Cu2+ + 2e- → Cu
B. Cu2+ + e- → Cu+
Correct C. Cu2+ + 2e- → 2Cu
D. Cu2+ + e- → Cu

Correct Answer: C

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Question 17 View Details
A metal M has an atomic radius of 135 pm and a first ionization energy of 520 kJ/mol. The metal is a member of the alkali metal group. What is the identity of the metal?
A. Li
Correct B. Na
C. K
D. Rb

Correct Answer: B

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Question 18 View Details
The diagram below shows a titration setup for the determination of the concentration of a weak acid.
A. The burette contains the acid.
B. The beaker contains the acid.
Correct C. The burette contains the base.
D. The beaker contains the base.

Correct Answer: C

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Question 19 View Details
A polymer is formed by the condensation reaction of two monomers, A and B. The molecular weight of the polymer is 100,000 g/mol. If the molecular weight of monomer A is 50 g/mol and the molecular weight of monomer B is 30 g/mol, what is the degree of polymerization?
Correct A. 100
B. 200
C. 500
D. 1000

Correct Answer: A

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Question 20 View Details
The diagram below shows a periodic table with the elements in the first period.
A. The elements in the first period are all metals.
B. The elements in the first period are all nonmetals.
Correct C. The elements in the first period are a mix of metals and nonmetals.
D. The elements in the first period are all metalloids.

Correct Answer: C

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Question 21 View Details
Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess oxygen.
A. 0.125 mol
Correct B. 0.25 mol
C. 0.5 mol
D. 1.0 mol

Correct Answer: B

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Question 22 View Details
A 2.5 M solution of HCl is mixed with a 2.5 M solution of NaOH. What is the pH of the resulting solution?
A. 0
B. 1
C. 2
Correct D. 7

Correct Answer: D

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Question 23 View Details
A sample of 0.5 g of a subs\tance is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.05 M
B. 0.1 M
Correct C. 0.5 M
D. 1.0 M

Correct Answer: C

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Question 24 View Details
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the resulting concentration of the solution?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 25 View Details
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the resulting concentration of the solution?
A. 0.5 M
B. 1.0 M
Correct C. 1.5 M
D. 2.0 M

Correct Answer: C

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