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POST UTME KSU 2024 Chemistry | Objective

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Question 1

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.1 M and 0.05 M, respectively, and the rate of reaction is 0.02 M/s after 10 minutes.

Correct A. \( k = 0.05 , \text{M}^{-1} , \text{s}^{-1} \)

B. \( k = 0.02 , \text{M}^{-1} , \text{s}^{-1} \)

C. \( k = 0.01 , \text{M}^{-1} , \text{s}^{-1} \)

D. \( k = 0.005 , \text{M}^{-1} , \text{s}^{-1} \)

Correct Answer: A

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Question 2

A sample of 1.0 g of an unknown metal carbonate is heated to produce 0.55 g of CO2. Calculate the molar mass of the metal carbonate.

A. \( 100 , \text{g/mol} \)

B. \( 150 , \text{g/mol} \)

Correct C. \( 200 , \text{g/mol} \)

D. \( 250 , \text{g/mol} \)

Correct Answer: C

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Question 3

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

A. \( 0.05 , \text{M} \)

Correct B. \( 0.1 , \text{M} \)

C. \( 0.2 , \text{M} \)

D. \( 0.5 , \text{M} \)

Correct Answer: B

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Question 4

A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the concentration of the resulting solution?

A. \( 1.0 , \text{M} \)

Correct B. \( 1.5 , \text{M} \)

C. \( 2.0 , \text{M} \)

D. \( 2.5 , \text{M} \)

Correct Answer: B

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Question 5

A sample of 1.0 g of an unknown metal is heated in air to produce 0.55 g of metal oxide. Calculate the mass of oxygen in the metal oxide.

A. \( 0.2 , \text{g} \)

B. \( 0.3 , \text{g} \)

Correct C. \( 0.4 , \text{g} \)

D. \( 0.5 , \text{g} \)

Correct Answer: C

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Question 6

Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 7

A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 8

The rate cons\tant of a first-order reaction is 0.05 min^\( -1 \). If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?

A. 0.01

B. 0.02

C. 0.03

Correct D. 0.04

Correct Answer: D

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Question 9

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 10

The half-life of a first-order reaction is 10 minutes. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 20 minutes?

A. 0.02

B. 0.03

C. 0.04

Correct D. 0.05

Correct Answer: D

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Question 11

A solution contains 2.5 g of NaCl in 50 mL of water. Calculate the molarity of the solution.

A. 0.085 M

Correct B. 0.0855 M

C. 0.086 M

D. 0.0865 M

Correct Answer: B

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Question 12

The boiling point of a solution containing 10% w/w of glu\cose in water is 102.5°C. Calculate the boiling point elevation.

Correct A. 0.5°C

B. 0.6°C

C. 0.7°C

D. 0.8°C

Correct Answer: A

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Question 13

A sample of a polymer has a molecular weight of 50000 g/mol. Calculate the number of monomer units in the polymer.

A. 1000

Correct B. 10000

C. 50000

D. 100000

Correct Answer: B

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Question 14

A solution contains 2.5 g of NaCl in 50 mL of water. Calculate the molality of the solution.

A. 0.085 m

Correct B. 0.0855 m

C. 0.086 m

D. 0.0865 m

Correct Answer: B

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Question 15

The boiling point of a solution containing 10% w/w of glu\cose in water is 102.5°C. Calculate the boiling point elevation.

Correct A. 0.5°C

B. 0.6°C

C. 0.7°C

D. 0.8°C

Correct Answer: A

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Question 16

A sample of a polymer has a molecular weight of 50000 g/mol. Calculate the number of monomer units in the polymer.

A. 1000

Correct B. 10000

C. 50000

D. 100000

Correct Answer: B

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Question 17

A solution contains 2.5 g of NaCl in 50 mL of water. Calculate the molarity of the solution.

A. 0.085 M

Correct B. 0.0855 M

C. 0.086 M

D. 0.0865 M

Correct Answer: B

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Question 18

The boiling point of a solution containing 10% w/w of glu\cose in water is 102.5°C. Calculate the boiling point elevation.

Correct A. 0.5°C

B. 0.6°C

C. 0.7°C

D. 0.8°C

Correct Answer: A

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Question 19

A sample of a polymer has a molecular weight of 50000 g/mol. Calculate the number of monomer units in the polymer.

A. 1000

Correct B. 10000

C. 50000

D. 100000

Correct Answer: B

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Question 20

The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the term for the minimum amount of a subs\tance required to saturate a given amount of solvent?

A. Solubility limit

B. Solubility product

C. Solubility equilibrium

Correct D. Solubility threshold

Correct Answer: D

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Question 21

The periodic table is a tabular arrangement of the known chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties. What is the term for the horizontal rows of the periodic table?

Correct A. Periods

B. Groups

C. Blocks

D. Families

Correct Answer: A

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Question 22

The non-metals are a group of elements that are located in the upper right corner of the periodic table. What is the term for the process by which a non-metal gains electrons to form a negatively charged ion?

A. Ionization

Correct B. Electron gain

C. Proton loss

D. Neutron capture

Correct Answer: B

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Question 23

The atomic structure of an element is determined by the number of protons, neutrons, and electrons present in its atoms. What is the term for the region around the nucleus where electrons are found?

A. Atomic radius

Correct B. Electron cloud

C. Nuclear radius

D. Proton cloud

Correct Answer: B

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Question 24

Chemical kinetics is the study of the rates of chemical reactions. What is the term for the rate cons\tant of a reaction?

Correct A. Rate cons\tant

B. Reaction rate

C. Activation energy

D. Catalyst

Correct Answer: A

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Question 25

Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) is decomposed according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).

A. 0.050 mol

Correct B. 0.100 mol

C. 0.150 mol

D. 0.200 mol

Correct Answer: B

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