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POST UTME CHRISTOPHER UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME CHRISTOPHER UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?

A. 1,2-dibromocyclohexane

Correct B. 1,4-dibromocyclohexane

C. cis-1,2-dibromocyclohexane

D. trans-1,2-dibromocyclohexane

Correct Answer: B

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Question 2

A solution of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 2.00

B. 3.00

Correct C. 4.00

D. 5.00

Correct Answer: C

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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 titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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Question 4

The polymerization of ethylene to produce polyethylene is an example of what type of polymerization reaction?

A. Condensation polymerization

Correct B. Addition polymerization

C. Ring-opening polymerization

D. Step-growth polymerization

Correct Answer: B

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Question 5

The environmental impact of the use of plastics has become a major concern in recent years. What is one of the main reasons for this concern?

A. The production of plastics requires large amounts of energy

Correct B. The disposal of plastics can lead to pollution of the environment

C. The use of plastics can contribute to climate change

D. The production of plastics can lead to the depletion of natural resources

Correct Answer: B

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Question 6

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentration of NO is 0.1 M, the initial concentration of O2 is 0.2 M, and after 10 minutes, the concentration of NO is 0.05 M and the concentration of O2 is 0.15 M. The rate cons\tant is related to the rate cons\tant by the equation: ln\( [NO]0/[NO]t \) = kt.

A. 0.05 min^-1

Correct B. 0.1 min^-1

C. 0.2 min^-1

D. 0.3 min^-1

Correct Answer: B

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Question 7

A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. The pH of the solution after the addition of 20 mL of HCl is 3.5. What is the pH of the solution after the addition of 40 mL of HCl?

A. 2.0

B. 2.5

Correct C. 3.0

D. 3.5

Correct Answer: C

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Question 8

A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the molecular weight of monomer A?

A. 50,000 g/mol

B. 60,000 g/mol

Correct C. 70,000 g/mol

D. 80,000 g/mol

Correct Answer: C

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Question 9

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

A. 7.0

Correct B. 8.0

C. 9.0

D. 10.0

Correct Answer: B

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Question 10

A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. The pH of the solution after the addition of 20 mL of HCl is 3.5. What is the pH of the solution after the addition of 40 mL of HCl?

A. 2.0

B. 2.5

Correct C. 3.0

D. 3.5

Correct Answer: C

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Question 11

Determine the major product of the reaction between 2-methylpropene and HCl.

Correct A. 1-chloro-2-methylpropane

B. 2-chloro-2-methylpropane

C. 1-chloro-2-methylpropene

D. 2-chloro-2-methylpropene

Correct Answer: A

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Question 12

A 25.0 mL sample of 0.100 M NaOH is mixed with 25.0 mL of 0.100 M HCl. What is the pH of the resulting solution?

A. 7.00

Correct B. 7.50

C. 8.00

D. 9.00

Correct Answer: B

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Question 13

A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

A. 0.0500 M

Correct B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: B

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Question 14

A 2.00 g sample of a subs\tance is dissolved in 100.0 mL of water. If the resulting solution has a concentration of 0.100 M, what is the molar mass of the subs\tance?

A. 20.0 g/mol

Correct B. 40.0 g/mol

C. 60.0 g/mol

D. 80.0 g/mol

Correct Answer: B

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Question 15

A diagram of a chromatography setup is shown below. If the retention time of a particular compound is 10.0 minutes, what is the concentration of the compound in the sample?

A. 0.100 M

Correct B. 0.200 M

C. 0.500 M

D. 1.00 M

Correct Answer: B

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Question 16

Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -1.3 \).

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 17

The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: NaOH + HCl → NaCl + H2O. What is the type of reaction?

A. Synthesis reaction

B. Decomposition reaction

Correct C. Neutralization reaction

D. Combustion reaction

Correct Answer: C

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Question 18

A polymer has a molecular weight of 100,000 g/mol. If 10 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?

A. 0.1 g/L

B. 1 g/L

Correct C. 10 g/L

D. 100 g/L

Correct Answer: C

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Question 19

The element with atomic number 12 is _______.

A. Magnesium

Correct B. Calcium

C. Strontium

D. Barium

Correct Answer: B

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Question 20

The reaction 2Al + Fe2O3 → Al2O3 + 2Fe is an example of a _______ reaction.

A. Synthesis reaction

B. Decomposition reaction

Correct C. Single displacement reaction

D. Combustion reaction

Correct Answer: C

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Question 21

The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?

Correct A. 0.01 M

B. 0.02 M

C. 0.03 M

D. 0.04 M

Correct Answer: A

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Question 22

A 2.5 L flask contains 0.5 mol of an ideal gas at 300 K. What is the pressure of the gas?

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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Question 23

A solution of 0.1 M HCl 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 24

A sample of a subs\tance has a mass of 25 g and a volume of 10 mL. What is its density?

Correct A. 2.5 g/mL

B. 2.0 g/mL

C. 1.5 g/mL

D. 1.0 g/mL

Correct Answer: A

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Question 25

A 1.0 L flask contains 0.5 mol of an ideal gas at 300 K. What is the entropy change of the gas?

A. 10 J/K

B. 20 J/K

Correct C. 30 J/K

D. 40 J/K

Correct Answer: C

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