POST UTME CRAWFORD UNIVERSITY 2018 Chemistry | Objective

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Question 1 View Details
Determine the major product of the reaction between 2-methylpropene and HBr.
Correct A. 1-bromo-2-methylpropane
B. 2-bromo-2-methylpropane
C. 1-bromo-3-methylbu\tane
D. 2-bromo-3-methylbu\tane

Correct Answer: A

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Question 2 View Details
The half-life of a first-order reaction is 20 minutes. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 40 minutes?
A. 0.05 M
Correct B. 0.025 M
C. 0.0125 M
D. 0.0075 M

Correct Answer: B

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Question 3 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. 8
C. 9
D. 10

Correct Answer: A

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Question 4 View Details
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is used to titrate 25 mL of 0.1 M HCl, what is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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

Correct Answer: B

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Question 6 View Details
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-methylbu\tane
D. 2-chloro-2-methylbu\tane

Correct Answer: A

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Question 7 View Details
What is the pH of a 0.1 M solution of HCl?
A. 0.1
Correct B. 1
C. 10
D. 100

Correct Answer: B

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Question 8 View Details
A 25.0 mL sample of 0.5 M NaOH is titrated with 1.0 M HCl. What is the pH of the solution after the titration?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 9 View Details
A diagram of a titration apparatus is shown below. 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 separate the titrant and analyte

Correct Answer: A

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Question 10 View Details
A diagram of a titration apparatus is shown below. What is the purpose of the pipette?
A. To measure the volume of the titrant
Correct B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte

Correct Answer: B

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Question 11 View Details
A polymer is formed by the condensation reaction between two monomers, A and B. If the molecular weight of the polymer is 100,000 g/mol and the molecular weight of monomer A is 50,000 g/mol, what is the molecular weight of monomer B?
A. 50,000 g/mol
Correct B. 75,000 g/mol
C. 25,000 g/mol
D. 10,000 g/mol

Correct Answer: B

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Question 12 View Details
A solution of NaOH is titrated with a solution of HCl. If 25 mL of NaOH solution is required to neutralize 50 mL of HCl solution, what is the concentration of the HCl solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.5 M
D. 1.0 M

Correct Answer: B

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Question 13 View Details
A metal M has a density of 8 g/cm^3 and a molar mass of 200 g/mol. What is the volume of 1 mole of M in cm^3?
A. 100 cm^3
Correct B. 200 cm^3
C. 400 cm^3
D. 800 cm^3

Correct Answer: B

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Question 14 View Details
A solution of NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1.0 g/L
Correct C. 10 g/L
D. 100 g/L

Correct Answer: C

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Question 15 View Details
A metal M has a s\tandard reduction potential of +0.5 V. What is the s\tandard cell potential of a cell consisting of M/M^2+ and Zn^2+/Zn?
A. -0.5 V
Correct B. +0.5 V
C. +1.0 V
D. +1.5 V

Correct Answer: B

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