POST UTME SUMMIT UNIVERSITY 2024 Chemistry | Objective

Are you preparing for POST UTME SUMMIT UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 0.125 mol
Correct B. 0.250 mol
C. 0.500 mol
D. 1.00 mol

Correct Answer: B

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Question 2
A sample of hydrogen gas (H2) is collected over water at 25°C and 1 atm. If the total pressure is 755 mmHg, what is the partial pressure of hydrogen gas?
A. 600 mmHg
B. 700 mmHg
Correct C. 750 mmHg
D. 800 mmHg

Correct Answer: C

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Question 3
A solution contains 0.250 M NaOH and 0.100 M HCl. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 4
A 0.500 L sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the titration?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 5
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the titration?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 6
The atomic radius of an element decreases as you move from left to right across a period in the periodic table. Which of the following elements has the largest atomic radius?
A. Potassium (K)
B. Sodium (Na)
Correct C. Lithium (Li)
D. Francium (Fr)

Correct Answer: C

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Question 7
A solution contains 2.5 g of NaCl in 50 mL of water. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.5 M
D. 1.0 M

Correct Answer: B

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Question 8
A sample of a gas occupies 2.5 L at a pressure of 1.5 atm. What is the volume of the gas at a pressure of 3.0 atm, assuming the temperature remains cons\tant?
A. 1.0 L
Correct B. 1.5 L
C. 2.0 L
D. 2.5 L

Correct Answer: B

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Question 9
A solution contains 10% w/v of NaOH. What is the molarity of the solution?
Correct A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1.0 M

Correct Answer: A

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Question 10
A sample of a gas occupies 2.5 L at a pressure of 1.5 atm. What is the volume of the gas at a pressure of 3.0 atm, assuming the temperature remains cons\tant?
A. 1.0 L
Correct B. 1.5 L
C. 2.0 L
D. 2.5 L

Correct Answer: B

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Question 11
Calculate the molar mass of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. The atomic masses of carbon, hydrogen, and oxygen are 12.01 g/mol, 1.008 g/mol, and 16.00 g/mol, respectively.
A. 84.0 g/mol
Correct B. 96.0 g/mol
C. 108.0 g/mol
D. 120.0 g/mol

Correct Answer: B

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Question 12
Identify the type of hydrocarbon represented by the molecular formula C5H12.
Correct A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon

Correct Answer: A

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Question 13
A 2.50 M solution of NaOH is prepared by dissolving 50.0 g of NaOH in 1.00 L of water. Calculate the concentration of the solution in molarity.
A. 2.00 M
Correct B. 2.50 M
C. 3.00 M
D. 3.50 M

Correct Answer: B

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Question 14
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6(s).
A. -2800 kJ/mol
B. -2900 kJ/mol
Correct C. -3000 kJ/mol
D. -3100 kJ/mol

Correct Answer: C

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Question 15
A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the partial pressure of the gas is 0.900 atm, calculate the mole \fraction of the gas.
Correct A. 0.900
B. 0.950
C. 0.990
D. 0.995

Correct Answer: A

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Question 16
The atomic radius of an element is 100 pm. If the element is in its ground state, what is the expected value of its atomic radius in the excited state?
A. 50 pm
Correct B. 150 pm
C. 200 pm
D. 250 pm

Correct Answer: B

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Question 17
A solution of sulfuric acid (H2SO4) is prepared by dissolving 20 g of the acid in 100 g of water. What is the molarity of the solution?
A. 0.5 M
Correct B. 1.0 M
C. 2.0 M
D. 3.0 M

Correct Answer: B

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Question 18
A redox reaction involves the oxidation of iron (Fe) to iron(III) oxide (Fe2O3). The reaction is represented by the equation: \( 4Fe + 3O_2 \rightarrow 2Fe_2O_3 \). What is the oxidation number of iron in the product?
A. +2
Correct B. +3
C. +4
D. +5

Correct Answer: B

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Question 19
A mixture of 10 g of sodium chloride (NaCl) and 20 g of potassium chloride (KCl) is dissolved in 100 g of water. What is the concentration of the solution in terms of molality?
A. 0.1 m
Correct B. 0.2 m
C. 0.3 m
D. 0.4 m

Correct Answer: B

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Question 20
A solution of acetic acid (CH3COOH) is prepared by dissolving 10 g of the acid in 100 g of water. What is the pH of the solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 21
A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 100 g of water. Calculate the molality of the solution.
A. 0.25 mol/kg
B. 0.5 mol/kg
Correct C. 1.0 mol/kg
D. 1.5 mol/kg

Correct Answer: C

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Question 22
A mixture of 1.0 g of NaOH and 1.0 g of HCl is heated to produce water and sodium chloride. Calculate the mass of water produced.
A. 0.5 g
Correct B. 1.0 g
C. 1.5 g
D. 2.0 g

Correct Answer: B

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Question 23
A gas at 25°C and 1 atm is compressed to 2 atm. Calculate the new temperature of the gas.
A. 30°C
B. 35°C
Correct C. 40°C
D. 45°C

Correct Answer: C

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Question 24
A solution of 10% w/v glu\cose in water is prepared. Calculate the mass of glu\cose required to prepare 100 mL of solution.
A. 1.0 g
Correct B. 2.0 g
C. 3.0 g
D. 4.0 g

Correct Answer: B

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Question 25
A mixture of 2.0 g of NaOH and 2.0 g of HCl is heated to produce water and sodium chloride. Calculate the mass of water produced.
A. 1.0 g
Correct B. 2.0 g
C. 3.0 g
D. 4.0 g

Correct Answer: B

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