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POST UTME BELLS UNIVERSITY 2017 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 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of moles of nitrogen gas (N2) produced when 2.5 g of ammonia (NH3) is decomposed according to the equation: 2NH3(g) → N2(g) + 3H2(g). The molar mass of NH3 is 17.03 g/mol.

A. 0.15 mol

Correct B. 0.25 mol

C. 0.30 mol

D. 0.45 mol

Correct Answer: B

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Question 2

A 2.5 M solution of sulfuric acid (H2SO4) is titrated with 0.5 M sodium hydroxide (NaOH) solution. Calculate the pH of the solution after 25 mL of NaOH has been added. The dissociation cons\tant of H2SO4 is 1.2 × 10^\( -2 \).

A. 1.2

B. 1.5

Correct C. 2.0

D. 2.5

Correct Answer: C

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Question 3

A 1.0 L flask contains 0.5 mol of oxygen gas (O2) at a pressure of 2.0 atm. What is the partial pressure of oxygen gas in the flask?

Correct A. 1.0 atm

B. 1.5 atm

C. 2.0 atm

D. 2.5 atm

Correct Answer: A

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Question 4

A 0.5 M solution of sodium chloride (NaCl) is electrolyzed u\sing a current of 2.0 A. Calculate the mass of chlorine gas (Cl2) produced at the anode after 10 minutes.

A. 0.15 g

Correct B. 0.30 g

C. 0.45 g

D. 0.60 g

Correct Answer: B

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Question 5

A 1.0 L flask contains 0.5 mol of carbon dioxide gas (CO2) at a temperature of 298 K. What is the volume of the flask if the pressure is 1.0 atm?

Correct A. 1.0 L

B. 1.5 L

C. 2.0 L

D. 2.5 L

Correct Answer: A

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Question 6

The solubility of a subs\tance is a measure of its ability to dissolve in a solvent. Which of the following statements about the solubility of a subs\tance is correct?

A. The solubility of a subs\tance is directly proportional to its molecular weight.

Correct B. The solubility of a subs\tance is inversely proportional to its molecular weight.

C. The solubility of a subs\tance is indep\endent of its molecular weight.

D. The solubility of a subs\tance is directly proportional to the temperature of the solvent.

Correct Answer: B

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Question 7

The periodic table is a tabular arrangement of the elements, organized by their atomic number, electron configuration, and recurring chemical properties. Which of the following elements is a noble gas?

A. Carbon

B. Nitrogen

C. Oxygen

Correct D. Argon

Correct Answer: D

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Question 8

The s\tandard enthalpy of formation of a compound is the change in enthalpy that occurs when one mole of the compound is formed from its constituent elements in their s\tandard states. Which of the following compounds has a negative s\tandard enthalpy of formation?

A. CO2

Correct B. H2O

C. NH3

D. CH4

Correct Answer: B

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Question 9

The half-reaction method is a technique used to balance redox reactions. Which of the following steps is part of the half-reaction method?

Correct A. Identifying the oxidizing and reducing agents

B. Balancing the charges on both sides of the equation

C. Adding H2O to the equation

D. Adding H+ to the equation

Correct Answer: A

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Question 10

The non-metals are a group of elements that are located in the upper right corner of the periodic table. Which of the following non-metals is a noble gas?

A. Carbon

B. Nitrogen

C. Oxygen

Correct D. Argon

Correct Answer: D

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Question 11

The reaction of nitrogen dioxide with water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. What is the oxidation state of nitrogen in the product HNO3?

Correct A. +5

B. +3

C. +4

D. +6

Correct Answer: A

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Question 12

A 2.5 M solution of sulfuric acid (H2SO4) is prepared by dissolving 25.0 g of H2SO4 in water to make 250 mL of solution. What is the concentration of the solution in mol/L?

A. 0.1 M

B. 0.2 M

Correct C. 0.5 M

D. 1.0 M

Correct Answer: C

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Question 13

The diagram below shows the setup for a simple electrolysis experiment. What is the purpose of the U-tube in the setup?

A. To collect the gas produced at the anode

B. To collect the gas produced at the cathode

Correct C. To prevent the electrolyte from flowing out of the cell

D. To measure the volume of the electrolyte

Correct Answer: C

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Question 14

The reaction of sodium with chlorine is represented by the equation: 2Na + Cl2 → 2NaCl. What is the type of reaction that occurs in this equation?

Correct A. Synthesis reaction

B. Decomposition reaction

C. Single displacement reaction

D. Double displacement reaction

Correct Answer: A

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Question 15

The diagram below shows the structure of a molecule. What is the type of bond that exists between the two atoms labeled A and B?

Correct A. Covalent bond

B. Ionic bond

C. Hydrogen bond

D. Van der Waals force

Correct Answer: A

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Question 16

The reaction between sulfuric acid and sodium hydroxide is a classic example of a double displacement reaction. The balanced chemical equation for this reaction is: H2SO4 + 2NaOH → Na2SO4 + 2H2O. What is the oxidation state of sulfur in the product Na2SO4?

A. 0

B. 2

C. 4

Correct D. 6

Correct Answer: D

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Question 17

A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas in the flask?

Correct A. 1.01 × 10^5 Pa

B. 2.02 × 10^5 Pa

C. 3.03 × 10^5 Pa

D. 4.04 × 10^5 Pa

Correct Answer: A

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Question 18

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?

Correct A. 12.5 g

B. 25 g

C. 50 g

D. 100 g

Correct Answer: A

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Question 19

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

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 20

A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. What is the volume of the gas in the flask?

A. 1.0 L

Correct B. 2.0 L

C. 3.0 L

D. 4.0 L

Correct Answer: B

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Question 21

A 3.0 L flask contains 0.8 mol of an ideal gas at a temperature of 320 K. What is the pressure of the gas in the flask?

A. 1.01 × 10^5 Pa

B. 2.02 × 10^5 Pa

Correct C. 3.03 × 10^5 Pa

D. 4.04 × 10^5 Pa

Correct Answer: C

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Question 22

A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the volume of the gas in the flask?

A. 1.0 L

Correct B. 2.0 L

C. 3.0 L

D. 4.0 L

Correct Answer: B

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Question 23

A 3.0 L flask contains 0.8 mol of an ideal gas at a temperature of 320 K. What is the concentration of the gas in the flask?

A. 0.25 M

B. 0.3 M

Correct C. 0.35 M

D. 0.4 M

Correct Answer: C

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Question 24

A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas in the flask?

Correct A. 1.01 × 10^5 Pa

B. 2.02 × 10^5 Pa

C. 3.03 × 10^5 Pa

D. 4.04 × 10^5 Pa

Correct Answer: A

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Question 25

The polymerization of styrene in the presence of a free radical initiator yields a polymer with a molecular weight of 50,000 g/mol. If the degree of polymerization is 200, what is the molar mass of the monomer?

A. 250 g/mol

Correct B. 125 g/mol

C. 50 g/mol

D. 25 g/mol

Correct Answer: B

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