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POST UTME BSU 2022 Chemistry | Objective

Are you preparing for POST UTME BSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). Given that ΔH°(Al2O3) = -1675 kJ/mol and ΔH°(Fe) = -13.8 kJ/mol.

Correct A. -1688 kJ/mol

B. -1698 kJ/mol

C. -1683 kJ/mol

D. -1693 kJ/mol

Correct Answer: A

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Question 2

Identify the type of isomerism exhibited by the compound 1,2-dimethylcyclohexane.

A. Geometric isomerism

B. Stereoisomerism

Correct C. Conformational isomerism

D. Structural isomerism

Correct Answer: C

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Question 3

A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. Calculate the pH of the resulting solution.

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 4

The s\tandard Gibbs free energy change for the reaction: 2Fe(s) + O2(g) → 2FeO(s) is -400 kJ/mol. Calculate the equilibrium cons\tant (K) for the reaction.

Correct A. 1.00 × 10^10

B. 1.00 × 10^20

C. 1.00 × 10^30

D. 1.00 × 10^40

Correct Answer: A

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Question 5

A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. Calculate the concentration of the resulting solution.

A. 1.00 M

Correct B. 0.50 M

C. 0.25 M

D. 0.10 M

Correct Answer: B

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Question 6

Determine the pH of a 0.1 M solution of HCl if 25 mL of 1 M NaOH is added to 50 mL of the HCl solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 7

A sample of a polymer has a molecular weight of 100,000 g/mol. If 0.5 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?

A. 0.1

B. 0.5

Correct C. 1

D. 5

Correct Answer: C

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Question 8

A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas if the initial volume is 2 L?

A. 1

B. 2

C. 4

Correct D. 8

Correct Answer: D

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Question 9

A 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 10

A sample of a hydrocarbon has a molecular formula of C5H12. What is the type of hydrocarbon?

Correct A. Alkane

B. Alkene

C. Alkyne

D. Aromatic

Correct Answer: A

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Question 11

Determine the number of stereocenters in the following compound: CH3CH(OH)CH2CH3.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 12

Calculate the s\tandard enthalpy of formation of CO2(g) from the following reaction: C(s) + O2(g) → CO2(g). The s\tandard enthalpy of formation of C(s) is -393.5 kJ/mol, and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.

A. -393.5 kJ/mol

B. -393.5 kJ/mol + 0 kJ/mol

C. -393.5 kJ/mol - 0 kJ/mol

Correct D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol

Correct Answer: D

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Question 13

A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.

A. 200 g/mol

Correct B. 500 g/mol

C. 1000 g/mol

D. 2000 g/mol

Correct Answer: B

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Question 14

Determine the pH of a 0.1 M solution of HCl.

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 15

A metal has a density of 10 g/cm^3 and a volume of 10 cm^3. Calculate the mass of the metal.

Correct A. 100 g

B. 200 g

C. 500 g

D. 1000 g

Correct Answer: A

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Question 16

Determine the pH of a 0.1 M solution of HCl at 25°C. The dissociation cons\tant of HCl is 1.0 × 10^\( -7 \).

A. 1.0

B. 2.0

C. 3.0

Correct D. 4.0

Correct Answer: D

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Question 17

A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.0 atm

B. 2.0 atm

C. 3.0 atm

Correct D. 4.0 atm

Correct Answer: D

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Question 18

A solution contains 0.1 M HCl and 0.1 M NaOH. Determine the pH of the solution after mixing 50 mL of each solution.

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 19

A 100 mL sample of a 0.1 M solution of FeCl3 is electrolyzed for 5 minutes. Calculate the mass of Fe deposited at the cathode.

A. 0.1 g

B. 0.2 g

Correct C. 0.3 g

D. 0.4 g

Correct Answer: C

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Question 20

A 1.0 L flask contains 0.5 mol of an ideal gas at 25°C. Calculate the work done by the gas in expanding from 0.5 L to 1.5 L.

A. 1.0 J

B. 2.0 J

Correct C. 3.0 J

D. 4.0 J

Correct Answer: C

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Question 21

Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the ion product of water is 10^\( -14 \).

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 22

A 25 mL sample of a polymer solution contains 0.5 g of polymer. If the density of the polymer is 1.2 g/mL, what is the concentration of the polymer solution in g/mL?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 23

A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. Write the balanced equation for this reaction.

Correct A. Fe2+ + MnO4- → Fe3+ + Mn2+

B. Fe2+ + MnO4- → Fe3+ + MnO2

C. Fe2+ + MnO4- → Fe2+ + Mn2+

D. Fe3+ + MnO4- → Fe2+ + Mn2+

Correct Answer: A

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Question 24

A metal with an atomic number of 24 is heated in a crucible. The resulting metal has an atomic number of 22. What is the name of the metal that was heated?

A. Chromium

Correct B. Manganese

C. Iron

D. Copper

Correct Answer: B

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Question 25

A periodic table shows that the element with atomic number 8 has an electron configuration of 1s2 2s2 2p6. What is the name of this element?

Correct A. Oxygen

B. Nitrogen

C. Carbon

D. Fluorine

Correct Answer: A

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