POST UTME SUMMIT UNIVERSITY 2019 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 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 2
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?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 3
The atomic radius of an element decreases across a period from left to right. Which of the following elements has the largest atomic radius?
Correct A. Li
B. Na
C. K
D. Rb

Correct Answer: A

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Question 4
A diagram of a plant cell is shown below. Identify the part labeled A.
Correct A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole

Correct Answer: A

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Question 5
The rate cons\tant of a reaction is given by the equation k = Ae^\( -Ea/RT \). If the rate cons\tant is 0.1 s^-1, the activation energy is 50 kJ/mol, and the temperature is 300 K, what is the value of A?
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 6
At 273.15 K, 1 mole of an ideal gas occupies a volume of 22.4 L. If the temperature is increased to 373.15 K, what is the new volume of the gas, assuming the same number of moles and cons\tant pressure?
Correct A. 44.8 L
B. 22.4 L
C. 88.0 L
D. 55.2 L

Correct Answer: A

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Question 7
A 2.50 g sample of a non-metallic element is found to have a mass of 2.00 g after being heated in a Bunsen burner flame. What is the mass of oxygen that was added to the element during combustion?
Correct A. 0.50 g
B. 1.00 g
C. 1.50 g
D. 2.00 g

Correct Answer: A

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Question 8
A solution of sodium hydroxide (NaOH) is prepared by dissolving 10.0 g of NaOH in 100.0 mL of water. What is the molarity of the solution?
A. 0.10 M
B. 0.50 M
Correct C. 1.00 M
D. 2.00 M

Correct Answer: C

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Question 9
A sample of a gas is collected over water at a temperature of 25°C and a pressure of 1.00 atm. If the vapor pressure of water at 25°C is 0.0313 atm, what is the partial pressure of the gas?
Correct A. 0.9687 atm
B. 0.9697 atm
C. 0.9707 atm
D. 0.9717 atm

Correct Answer: A

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Question 10
A 5.00 g sample of a non-metallic element is found to have a mass of 3.00 g after being heated in a Bunsen burner flame. What is the mass of oxygen that was added to the element during combustion?
Correct A. 2.00 g
B. 1.50 g
C. 1.00 g
D. 0.50 g

Correct Answer: A

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Question 11
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.
A. 2.00
B. 2.50
Correct C. 3.00
D. 3.50

Correct Answer: C

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Question 12
The s\tandard electrode potential of the cell is 1.10 V. If the cell is connected to a 10.0 Ω resistor, what is the current flowing through the cell?
Correct A. 0.11 A
B. 0.22 A
C. 0.33 A
D. 0.44 A

Correct Answer: A

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Question 13
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 14
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl added.
A. 0.0025 mol
Correct B. 0.0050 mol
C. 0.0075 mol
D. 0.0100 mol

Correct Answer: B

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Question 15
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the concentration of HCl after the addition of 25.0 mL of NaOH?
A. 0.0500 M
B. 0.0750 M
Correct C. 0.100 M
D. 0.125 M

Correct Answer: C

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Question 16
Determine 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. 120 g/mol
B. 140 g/mol
Correct C. 160 g/mol
D. 180 g/mol

Correct Answer: C

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Question 17
A 2.5 L flask contains 0.500 mol of an ideal gas at 298 K. What is the pressure of the gas?
A. 1.01 x 10^2 Pa
Correct B. 1.01 x 10^3 Pa
C. 1.01 x 10^4 Pa
D. 1.01 x 10^5 Pa

Correct Answer: B

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Question 18
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 19
A 250 mL sample of a 0.500 M solution of NaOH is titrated with a 1.0 M solution of HCl. What is the volume of HCl required to reach the equivalence point?
A. 100 mL
Correct B. 200 mL
C. 250 mL
D. 300 mL

Correct Answer: B

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Question 20
A 1.0 L flask contains 0.500 mol of an ideal gas at 298 K. What is the entropy change of the gas?
A. 1.01 x 10^-3 J/K
B. 1.01 x 10^-2 J/K
Correct C. 1.01 x 10^-1 J/K
D. 1.01 x 10^0 J/K

Correct Answer: C

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Question 21
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. Calculate 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 22
A mixture of 25.0 g of glu\cose (C6H12O6) and 15.0 g of fructose (C6H12O6) is dissolved in 200 mL of water. Calculate the molality of the solution.
A. 0.2 m
B. 0.4 m
Correct C. 0.6 m
D. 0.8 m

Correct Answer: C

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Question 23
A 10.0 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 5.0 mL
Correct B. 10.0 mL
C. 15.0 mL
D. 20.0 mL

Correct Answer: B

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Question 24
A 25.0 mL sample of a solution containing 0.2 M H2SO4 is titrated with 0.2 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 12.5 mL
Correct B. 25.0 mL
C. 37.5 mL
D. 50.0 mL

Correct Answer: B

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Question 25
A 50.0 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 25.0 mL
Correct B. 50.0 mL
C. 75.0 mL
D. 100.0 mL

Correct Answer: B

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