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POST UTME BABCOCK UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME BABCOCK UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

Determine the number of unpaired electrons in the ground state of a neutral atom of the element with atomic number 17.

A. 1

Correct B. 3

C. 5

D. 7

Correct Answer: B

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Question 2

A 2.5 M solution of NaOH is mixed with 1.0 M HCl. What is the resulting concentration of the salt formed?

A. 1.0 M

Correct B. 2.0 M

C. 2.5 M

D. 5.0 M

Correct Answer: B

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Question 3

The diagram below shows a titration setup. What is the purpose of the burette?

Correct A. To measure the volume of the acid

B. To measure the volume of the base

C. To mix the acid and base

D. To measure the pH of the solution

Correct Answer: A

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Question 4

A sample of a metal oxide has a mass of 25.0 g and a volume of 2.5 cm^3. What is the density of the metal oxide?

A. 5.0 g/cm^3

Correct B. 10.0 g/cm^3

C. 15.0 g/cm^3

D. 20.0 g/cm^3

Correct Answer: B

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Question 5

The diagram below shows a periodic table. Which element has the atomic number 6?

Correct A. Carbon

B. Nitrogen

C. Oxygen

D. Fluorine

Correct Answer: A

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Question 6

Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 7

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.0025

B. 0.0050

C. 0.0075

Correct D. 0.0100

Correct Answer: D

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Question 8

A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution at the equivalence point.

A. 7

B. 8

C. 9

Correct D. 10

Correct Answer: D

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Question 9

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl present in the original sample.

Correct A. 0.0025

B. 0.0050

C. 0.0075

D. 0.0100

Correct Answer: A

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Question 10

A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 25.0 mL

B. 50.0 mL

C. 75.0 mL

Correct D. 100.0 mL

Correct Answer: D

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Question 11

The reaction of sodium with water is highly exothermic. What is the primary reason for this exothermic nature?

Correct A. The reaction releases a large amount of heat energy due to the breaking of strong ionic bonds.

B. The reaction releases a large amount of heat energy due to the formation of strong covalent bonds.

C. The reaction releases a large amount of heat energy due to the release of electrons from the sodium atoms.

D. The reaction releases a large amount of heat energy due to the formation of hydrogen gas.

Correct Answer: A

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Question 12

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the concentration of the resulting solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.05 M

D. 0.01 M

Correct Answer: B

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Question 13

A 2.0 g sample of a polymer is dissolved in 100 mL of solvent. What is the molarity of the solution?

Correct A. 0.02 M

B. 0.02 g/mL

C. 0.2 M

D. 0.02 g/100 mL

Correct Answer: A

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Question 14

A redox reaction involves the transfer of 2 electrons from a species with an oxidation state of +2 to a species with an oxidation state of -2. What is the change in oxidation state of the species that loses electrons?

Correct A. +4

B. -4

C. +2

D. -2

Correct Answer: A

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Question 15

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 16

The electrolysis of water produces hydrogen gas at the cathode and oxygen gas at the anode. If the cell potential is 2.0 V, what is the theoretical yield of hydrogen gas in moles per Faraday?

A. 0.5 mol/F

Correct B. 1.0 mol/F

C. 2.0 mol/F

D. 4.0 mol/F

Correct Answer: B

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Question 17

A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.0313 atm, what is the mole \fraction of nitrogen gas?

Correct A. 0.999

B. 0.9995

C. 0.9999

D. 0.99995

Correct Answer: A

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Question 18

A metal oxide is reduced to its corresponding metal by heating in a stream of hydrogen gas. If the reaction is represented by the equation: \[\text{M}_2\text{O}_3 + 3\text{H}_2 \rightarrow 2\text{M} + 3\text{H}_2\text{O}\], what is the oxidation state of the metal (M)?

Correct A. +3

B. +2

C. +1

D. +4

Correct Answer: A

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Question 19

A solution of sulfuric acid is titrated with a solution of sodium hydroxide. If the initial concentration of sulfuric acid is 0.1 M and the initial concentration of sodium hydroxide is 0.2 M, what is the pH of the solution after the reaction is complete?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 20

A sample of a metal is heated in a stream of oxygen gas. If the reaction is represented by the equation: \[\text{M} + \frac{1}{2}\text{O}_2 \rightarrow \text{MO}\], what is the oxidation state of the metal (M)?

A. +2

Correct B. +3

C. +4

D. +5

Correct Answer: B

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