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POST UTME ELIZADE UNIVERSITY 2022 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 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

Determine the oxidation state of the underlined atom in the compound [Cr(H2O)6]Cl3.

Correct A. +3

B. +2

C. +6

D. +1

Correct Answer: A

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Question 2

A 25.0 mL sample of 0.100 M NaOH is mixed with 25.0 mL of 0.100 M HCl. Calculate 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 3

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. Burette

B. Conical Flask

C. Pipette

D. Thermometer

Correct Answer: A

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Question 4

A 2.50 g sample of a polymer is dissolved in 25.0 mL of solvent. Calculate the molar mass of the polymer if the osmotic pressure is 1.50 atm at 25°C.

A. 1000 g/mol

B. 2000 g/mol

Correct C. 5000 g/mol

D. 10000 g/mol

Correct Answer: C

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Question 5

The diagram below shows a molecule of glu\cose. Identify the type of bond labeled A.

Correct A. Single Bond

B. Double Bond

C. Triple Bond

D. Hydrogen Bond

Correct Answer: A

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Question 6

The reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is a classic example of a neutralization reaction. What is the pH of the resulting solution if 25.0 mL of 0.100 M NaOH is added to 50.0 mL of 0.100 M HCl?

A. 7.00

Correct B. 3.00

C. 2.00

D. 1.00

Correct Answer: B

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Question 7

A 2.50-g sample of an unknown hydrocarbon is burned in a combustion apparatus, producing 9.50 mL of CO2 gas at 25.0°C and 1.00 atm. What is the empirical formula of the hydrocarbon?

A. CH4

Correct B. C2H6

C. C3H8

D. C4H10

Correct Answer: B

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Question 8

A 0.100 M solution of acetic acid (CH3COOH) is titrated with 0.100 M sodium hydroxide (NaOH). What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 4.00

B. 5.00

Correct C. 6.00

D. 7.00

Correct Answer: C

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Question 9

A 2.00-g sample of an unknown salt is dissolved in 50.0 mL of water. The resulting solution has a conductivity of 0.100 S/m. What is the molar conductivity of the solution?

A. 100 S m^2/mol

Correct B. 200 S m^2/mol

C. 300 S m^2/mol

D. 400 S m^2/mol

Correct Answer: B

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Question 10

A 1.00-g sample of an unknown hydrocarbon is burned in a combustion apparatus, producing 5.00 mL of CO2 gas at 25.0°C and 1.00 atm. What is the molar mass of the hydrocarbon?

A. 20.0 g/mol

Correct B. 30.0 g/mol

C. 40.0 g/mol

D. 50.0 g/mol

Correct Answer: B

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Question 11

The atomic number of an element is 26. If the element is in its ground state, what is the number of electrons in a neutral atom of this element?

A. 25

Correct B. 26

C. 27

D. 28

Correct Answer: B

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Question 12

A sample of a gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the pressure is increased to 3.5 atm, what is the new volume of the gas?

Correct A. 1.0 L

B. 2.0 L

C. 3.0 L

D. 4.0 L

Correct Answer: A

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Question 13

A metal alloy is composed of 80% copper and 20% zinc. If a sample of the alloy weighs 250 g, what is the mass of copper in the sample?

A. 150 g

Correct B. 200 g

C. 250 g

D. 300 g

Correct Answer: B

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Question 14

The periodic table is arranged in a way that elements with similar properties are placed in the same group. Which of the following elements is a member of the same group as carbon?

Correct A. silicon

B. germanium

C. tin

D. lead

Correct Answer: A

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Question 15

A redox reaction involves the transfer of electrons from one species to another. Which of the following reactions is an example of a redox reaction?

A. 2H_2 + O_2 \rightarrow 2H_2O

Correct B. 2Na + Cl_2 \rightarrow 2NaCl

C. 2H_2O \rightarrow 2H_2 + O_2

D. 2NaCl \rightarrow 2Na + Cl_2

Correct Answer: B

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Question 16

The reaction between nitrogen dioxide and water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. If 2.5 moles of NO2 react with excess water, what is the limiting reac\tant?

Correct A. NO2

B. H2O

C. HNO3

D. NO

Correct Answer: A

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Question 17

A 2.5 M solution of sulfuric acid (H2SO4) is mixed with a 1.5 M solution of sodium hydroxide (NaOH). If 50 mL of each solution is used, what is the resulting pH?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 18

The diagram below represents a titration setup. If 25 mL of 0.5 M HCl is used to titrate 20 mL of 0.2 M NaOH, what is the resulting pH?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 19

The reaction between chlorine gas and potassium iodide is represented by the equation: Cl2 + 2KI → 2KCl + I2. If 2.5 moles of Cl2 react with excess KI, what is the limiting reac\tant?

Correct A. Cl2

B. KI

C. KCl

D. I2

Correct Answer: A

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Question 20

A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 1.5 M solution of hydrochloric acid (HCl). If 50 mL of each solution is used, what is the resulting pH?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 21

A 0.5 M solution of a weak acid HA is mixed with a 0.5 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 22

A 1.0 M solution of a weak acid HA is mixed with a 1.0 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 23

A 0.5 M solution of a weak acid HA is mixed with a 0.5 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 24

A 1.0 M solution of a weak acid HA is mixed with a 1.0 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 25

A 0.5 M solution of a weak acid HA is mixed with a 0.5 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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