POST UTME BELLS UNIVERSITY 2021 Chemistry | Objective

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Question 1 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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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