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POST UTME AFE BABALOLA UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME AFE BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

A polymer is formed by the condensation reaction between two monomers. If the molecular weight of the monomer is 100 g/mol, and the molecular weight of the polymer is 200 g/mol, what is the degree of polymerization?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 2

A solution of 2.0 g of glu\cose in 100 g of water has a boiling point elevation of 0.50°C. What is the molar mass of glu\cose?

A. 180 g/mol

B. 200 g/mol

Correct C. 220 g/mol

D. 240 g/mol

Correct Answer: C

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Question 3

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

A. 1/2 V

Correct B. 1/3 V

C. 2/3 V

D. V

Correct Answer: B

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Question 4

A solution of 0.1 M NaOH is titrated with 0.1 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 5

A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 g of water. What is the boiling point elevation of the solution?

A. 0.20°C

B. 0.30°C

Correct C. 0.40°C

D. 0.50°C

Correct Answer: C

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Question 6

A solution of potassium dichromate is titrated with iron(II) sulfate. The reaction is as follows: Cr2O72- + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O. If 25.0 mL of 0.0500 M Fe2+ is required to reach the \endpoint, what is the concentration of the dichromate solution?

A. 0.00250 M

Correct B. 0.00500 M

C. 0.0125 M

D. 0.0250 M

Correct Answer: B

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Question 7

A gas at 25°C and 1 atm is compressed to 4 atm. What is the new volume of the gas?

A. 0.25 L

B. 0.50 L

Correct C. 1.00 L

D. 2.00 L

Correct Answer: C

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Question 8

The diagram below shows a setup for electrolysis of water.

A. The anode is the cathode

B. The cathode is the anode

C. The anode is the left electrode

Correct D. The cathode is the right electrode

Correct Answer: D

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Question 9

A solution of 0.100 M NaOH is titrated with 0.0500 M HCl. What is the pH of the solution after 25.0 mL of HCl has been added?

A. 2.00

B. 3.00

Correct C. 4.00

D. 5.00

Correct Answer: C

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Question 10

A sample of a gas at 25°C and 1 atm has a volume of 2.00 L. What is the new volume of the gas if it is compressed to 4 atm?

A. 0.50 L

B. 1.00 L

Correct C. 2.00 L

D. 4.00 L

Correct Answer: C

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Question 11

A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. Calculate the ratio of the final pressure to the initial pressure.

Correct A. 1.33

B. 1.5

C. 2.0

D. 3.0

Correct Answer: A

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Question 12

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) and O2(g) from their elements in their s\tandard states.

Correct A. -110.5 kJ/mol

B. -393.5 kJ/mol

C. 110.5 kJ/mol

D. 393.5 kJ/mol

Correct Answer: A

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Question 13

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 1.0 L of water. Calculate the concentration of Cl- ions in 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 14

A first-order reaction has a rate cons\tant of 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, calculate the concentration after 10 min.

Correct A. 0.01 M

B. 0.05 M

C. 0.1 M

D. 0.2 M

Correct Answer: A

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Question 15

A voltaic cell consists of a zinc anode and a copper cathode. The s\tandard reduction potentials are E^\circ_{Zn^2+|Zn} = -0.76 V and E^\circ_{Cu^2+|Cu} = 0.34 V. Calculate the cell potential.

Correct A. 1.10 V

B. 1.10 V

C. 1.10 V

D. 1.10 V

Correct Answer: A

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Question 16

The atomic number of an element is 12. What is the number of protons in the nucleus of an atom of this element?

A. 11

Correct B. 12

C. 13

D. 14

Correct Answer: B

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Question 17

A 2.5 M solution of HCl is prepared by dissolving 25 g of HCl in water to make 1 L of solution. What is the pH of the solution?

A. 0.5

Correct B. 1.0

C. 1.5

D. 2.0

Correct Answer: B

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Question 18

The reaction between nitrogen and oxygen to form nitrogen dioxide is represented by the equation: \text{N}_2 + \text{O}_2 \rightarrow \text{NO}_2. What is the oxidation state of nitrogen in the product?

A. -2

B. +2

C. +4

Correct D. +6

Correct Answer: D

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Question 19

A 0.1 M solution of NaOH is prepared by dissolving 0.1 mol of NaOH in water to make 1 L of solution. What is the concentration of hydroxide ions in the solution?

A. 0.01 M

Correct B. 0.1 M

C. 1.0 M

D. 10 M

Correct Answer: B

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Question 20

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 21

The s\tandard reduction potential of the couple Zn2+/Zn is -0.76 V. If a zinc electrode is connected to a copper electrode with a s\tandard reduction potential of +0.34 V, what is the cell potential?

Correct A. -1.10 V

B. -0.44 V

C. +0.34 V

D. +0.76 V

Correct Answer: A

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Question 22

A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas?

A. 2.5 atm

Correct B. 3.5 atm

C. 4.5 atm

D. 5.5 atm

Correct Answer: B

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Question 23

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 20 years?

Correct A. 12.5 g

B. 25 g

C. 50 g

D. 100 g

Correct Answer: A

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Question 24

A solution contains 0.1 M NaCl. What is the concentration of Cl- ions?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 25

A 2.0 L flask contains 0.5 mol of an ideal gas at 37°C. What is the pressure of the gas?

A. 2.5 atm

Correct B. 3.5 atm

C. 4.5 atm

D. 5.5 atm

Correct Answer: B

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