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Subject

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POST UTME ELIZADE UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME ELIZADE 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 pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 2

A diagram of a titration setup is shown below. If 25.0 mL of 0.1 M NaOH is added to 25.0 mL of 0.1 M HCl, what is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 3

The diagram below shows a simple black and white chemistry apparatus setup for a titration reaction. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Test Tube

Correct Answer: A

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Question 4

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 25.0 mL of NaOH is added, what is the pH of the resulting solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 5

The diagram below shows a simple black and white chemistry apparatus setup for a titration reaction. Identify the part labeled B.

A. Burette

Correct B. Beaker

C. Conical Flask

D. Test Tube

Correct Answer: B

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Question 6

The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much of the subs\tance will remain after 15 days?

Correct A. 12.5 mg

B. 25 mg

C. 50 mg

D. 100 mg

Correct Answer: A

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Question 7

A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the solution after mixing?

A. 7

Correct B. 6

C. 5

D. 4

Correct Answer: B

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Question 8

A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?

A. 1 g/L

Correct B. 10 g/L

C. 100 g/L

D. 1000 g/L

Correct Answer: B

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Question 9

A cell has a potential difference of 1.5 V and a resis\tance of 10 Ω. What is the current flowing through the cell?

Correct A. 0.15 A

B. 0.3 A

C. 0.45 A

D. 0.6 A

Correct Answer: A

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Question 10

A solution contains 0.01 M HCl and 0.01 M NaOH. What is the pH of the solution after mixing?

A. 7

B. 6

C. 5

Correct D. 4

Correct Answer: D

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Question 11

Determine the molar mass of a polymer with the following repeating unit: CH2CH(CH3)CH2-

A. 60 g/mol

Correct B. 72 g/mol

C. 84 g/mol

D. 96 g/mol

Correct Answer: B

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Question 12

A solution contains 0.5 M NaCl and 0.2 M CaCl2. What is the concentration of Cl- ions?

A. 0.3 M

B. 0.5 M

Correct C. 0.7 M

D. 0.9 M

Correct Answer: C

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Question 13

The reaction: 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant of 0.05 s-1 at 298 K. What is the rate of reaction if the initial concentrations of NO and O2 are 0.1 M and 0.05 M, respectively?

A. 0.0005 M s-1

B. 0.001 M s-1

Correct C. 0.005 M s-1

D. 0.01 M s-1

Correct Answer: C

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Question 14

A 2.0 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. What is the molar mass of the hydrocarbon?

A. 20 g/mol

B. 40 g/mol

Correct C. 60 g/mol

D. 80 g/mol

Correct Answer: C

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Question 15

A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the solution after the reaction is complete?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 16

A gas at 300 K and 1 atm is compressed to 2 atm. Calculate the new volume of the gas, assuming ideal behavior.

Correct A. 0.5 L

B. 1 L

C. 2 L

D. 4 L

Correct Answer: A

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Question 17

A 2.5 M solution of NaOH is mixed with a 1.5 M solution of HCl. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 18

A metal with a density of 8.5 g/cm^3 has a mass of 25 g. Calculate the volume of the metal.

A. 2.9 cm^3

Correct B. 3.0 cm^3

C. 3.1 cm^3

D. 3.2 cm^3

Correct Answer: B

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Question 19

A solution contains 0.5 M NaOH and 0.5 M HCl. Calculate the pH of the solution.

A. 0

Correct B. 1

C. 2

D. 3

Correct Answer: B

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Question 20

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. Calculate the pH of the resulting solution.

A. 0

Correct B. 1

C. 2

D. 3

Correct Answer: B

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Question 21

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of CH4(g) u\sing Hess's law.

Correct A. -74.8 kJ/mol

B. -74.2 kJ/mol

C. -75.1 kJ/mol

D. -75.5 kJ/mol

Correct Answer: A

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Question 22

The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 10 years?

A. 50 g

B. 25 g

Correct C. 12.5 g

D. 6.25 g

Correct Answer: C

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Question 23

A 2.5 M solution of HCl is titrated with a 1.0 M solution of NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required?

A. 25 mL

Correct B. 50 mL

C. 75 mL

D. 100 mL

Correct Answer: B

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Question 24

The s\tandard reduction potential of the couple Zn2+/Zn is -0.76 V. If a cell is constructed with Zn as the anode and a s\tandard hydrogen electrode as the cathode, what is the cell potential?

Correct A. -0.76 V

B. -0.38 V

C. 0.38 V

D. 0.76 V

Correct Answer: A

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Question 25

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?

A. 100 g/mol

B. 200 g/mol

Correct C. 500 g/mol

D. 1000 g/mol

Correct Answer: C

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