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POST UTME BELLS UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME BELLS 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.

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Question 1

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution after 25.0 mL of NaOH has been added.

A. 1.00

B. 2.00

Correct C. 3.00

D. 4.00

Correct Answer: C

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Question 2

A diagram of a titration setup is shown below.

A. The burette contains the acid.

Correct B. The beaker contains the acid.

C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: B

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Question 3

A 2.50 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 1.75 g. What is the empirical formula of the oxide?

A. CO

B. CO2

Correct C. SO2

D. SO3

Correct Answer: C

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Question 4

A diagram of a gas collection apparatus is shown below.

Correct A. The flask contains the gas.

B. The tube contains the gas.

C. The flask contains the liquid.

D. The tube contains the liquid.

Correct Answer: A

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Question 5

A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. What is the partial pressure of the gas?

A. 0.95 atm

Correct B. 0.99 atm

C. 1.01 atm

D. 1.05 atm

Correct Answer: B

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Question 6

In a redox reaction, what is the role of the catalyst in the Haber-Bosch process?

Correct A. To increase the rate of reaction

B. To decrease the rate of reaction

C. To stabilize the reaction mixture

D. To facilitate the formation of nitrogen gas

Correct Answer: A

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Question 7

A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. Calculate the partial pressure of nitrogen gas in the sample.

A. 0.95 atm

Correct B. 0.98 atm

C. 1.02 atm

D. 1.05 atm

Correct Answer: B

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Question 8

A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the product at the cathode?

A. Oxygen gas

B. Hydrogen gas

Correct C. Sodium metal

D. Chlorine gas

Correct Answer: C

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Question 9

A sample of sulfur dioxide gas is collected over water at a temperature of 25°C and a pressure of 1 atm. Calculate the partial pressure of sulfur dioxide gas in the sample.

A. 0.90 atm

B. 0.92 atm

Correct C. 0.95 atm

D. 0.98 atm

Correct Answer: C

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Question 10

A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. What is the reaction at the equivalence point?

Correct A. NaOH + HCl → NaCl + H2O

B. NaOH + HCl → NaCl + H2O + NaOH

C. NaOH + HCl → NaCl + H2O + HCl

D. NaOH + HCl → NaCl + H2O + NaOH + HCl

Correct Answer: A

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Question 11

Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^\( -10 \) and the solubility product cons\tant (Ksp) for NaCl is 3.2 × 10^\( -9 \).

A. 1.0 × 10^\( -5 \) M

Correct B. 1.5 × 10^\( -5 \) M

C. 2.0 × 10^\( -5 \) M

D. 2.5 × 10^\( -5 \) M

Correct Answer: B

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Question 12

A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. If the reaction is allowed to go to completion, what is the concentration of the resulting solution?

A. 0.5 M HCl

B. 0.5 M NaOH

C. 1.0 M HCl

Correct D. 1.0 M NaOH

Correct Answer: D

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Question 13

A sample of a gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas, assuming that the temperature remains cons\tant?

A. 0.5 L

B. 1.0 L

Correct C. 2.0 L

D. 4.0 L

Correct Answer: C

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Question 14

A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. If the reaction is allowed to go to completion, what is the concentration of the resulting solution?

A. 0.5 M H2SO4

B. 0.5 M NaOH

C. 1.0 M H2SO4

Correct D. 1.0 M NaOH

Correct Answer: D

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Question 15

A sample of a gas at 25°C and 1 atm is expanded to 0.5 atm. What is the new volume of the gas, assuming that the temperature remains cons\tant?

A. 0.5 L

Correct B. 1.0 L

C. 2.0 L

D. 4.0 L

Correct Answer: B

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Question 16

The reaction between sulfuric acid and sodium hydroxide is a classic example of a neutralization reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.

Correct A. H2SO4 + NaOH → Na2SO4 + H2O

B. H2SO4 + NaOH → NaHSO4 + H2O

C. H2SO4 + NaOH → Na2SO4 + H2

D. H2SO4 + NaOH → NaHSO4 + NaOH

Correct Answer: A

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Question 17

A 2.5 M solution of hydrochloric acid (HCl) is titrated with a 0.5 M solution of sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?

Correct A. 12.5 mL

B. 25 mL

C. 50 mL

D. 100 mL

Correct Answer: A

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Question 18

The s\tandard enthalpy of formation of carbon dioxide (CO2) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of carbon monoxide (CO) if the s\tandard enthalpy of formation of carbon (C) is -717.1 kJ/mol and the s\tandard enthalpy of formation of oxygen (O2) is 0 kJ/mol?

Correct A. -110.5 kJ/mol

B. -110.5 kJ/mol

C. -110.5 kJ/mol

D. -110.5 kJ/mol

Correct Answer: A

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Question 19

A 1.0 M solution of sodium chloride (NaCl) is mixed with a 1.0 M solution of calcium chloride (CaCl2). What is the concentration of the resulting solution?

A. 1.0 M

Correct B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: B

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Question 20

A 2.0 M solution of acetic acid (CH3COOH) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). If 20 mL of NaOH is required to reach the equivalence point, what is the concentration of the resulting solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 21

A 1.0 M solution of hydrochloric acid (HCl) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). 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 22

A 2.0 M solution of sodium carbonate (Na2CO3) is mixed with a 1.0 M solution of hydrochloric acid (HCl). What is the concentration of the resulting solution?

A. 1.0 M

Correct B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: B

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Question 23

A 1.0 M solution of acetic acid (CH3COOH) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). If 20 mL of NaOH is required to reach the equivalence point, what is the concentration of the resulting solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 24

A 2.0 M solution of sodium chloride (NaCl) is mixed with a 1.0 M solution of calcium chloride (CaCl2). What is the concentration of the resulting solution?

A. 1.0 M

B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: VIEW ANSWER

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Question 25

The polymerization of styrene to polystyrene involves the addition of styrene monomers to form a long chain. Which of the following is the correct representation of the polymerization reaction?

Correct A. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{polystyrene} \]

B. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{polymer} \]

C. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{monomer} \]

D. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{dimer} \]

Correct Answer: A

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