POST UTME CALEB UNIVERSITY 2023 Chemistry | Objective

Are you preparing for POST UTME CALEB UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the concentration of HCl is 0.1 M.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 2
A diagram of a redox reaction is shown below. Identify the oxidizing agent.
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 3
Solve the equation \( \frac{dy}{dx} = \frac{y^2}{x^2} \) u\sing separation of variables.
Correct A. y = x^2
B. y = -x^2
C. y = x^3
D. y = -x^3

Correct Answer: A

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Question 4
A diagram of a titration setup is shown below. Identify the subs\tance being titrated.
A. A
Correct B. B
C. C
D. D

Correct Answer: B

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Question 5
A diagram of a redox reaction is shown below. Identify the reducing agent.
A. A
Correct B. B
C. C
D. D

Correct Answer: B

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Question 6
A 2.5 g sample of a compound containing only carbon and hydrogen was burned in oxygen and produced 2.5 L of CO2 at STP. Calculate the empirical formula of the compound.
A. CH4
Correct B. C2H6
C. C3H8
D. C4H10

Correct Answer: B

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Question 7
A solution of 0.1 M NaCl is mixed with a solution of 0.1 M AgNO3. If the reaction is allowed to proceed to completion, what is the concentration of the resulting solution?
Correct A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: A

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Question 8
A 2.0 L flask contains 0.5 M H2SO4. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
Correct A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: A

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Question 9
A 1.0 L flask contains 0.2 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
Correct A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: A

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Question 10
A 2.0 L flask contains 0.5 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
Correct A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: A

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Question 11
Determine the number of moles of $\text{O}_2$ required to completely oxidize 1.5 moles of $\text{C}_2\text{H}_6$ in a combustion reaction.
Correct A. 0.75
B. 1.5
C. 2.25
D. 3.0

Correct Answer: A

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Question 12
A 25.0 mL sample of 0.100 M $\text{H}_2\text{SO}_4$ is titrated with 0.0500 M $\text{NaOH}$. Calculate the number of moles of $\text{H}_2\text{SO}_4$ that reacted.
A. 0.00125
Correct B. 0.0025
C. 0.0050
D. 0.0075

Correct Answer: B

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Question 13
The $pH$ of a 0.100 M solution of $\text{HCl}$ is 1.00. What is the concentration of $\text{HCl}$ in a solution with a $pH$ of 2.00?
A. 0.100
B. 0.500
Correct C. 1.00
D. 5.00

Correct Answer: C

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Question 14
A sample of $\text{CaCO}_3$ weighing 2.50 g is decomposed to produce $\text{CaO}$ and $\text{CO}_2$. If the mass of $\text{CaO}$ produced is 1.75 g, what is the mass of $\text{CO}_2$ produced?
A. 0.75
B. 1.00
Correct C. 1.25
D. 1.50

Correct Answer: C

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Question 15
A 2.00 L sample of 0.100 M $\text{NaOH}$ is mixed with a 1.00 L sample of 0.0500 M $\text{HCl}$. What is the concentration of the resulting solution?
A. 0.0500
B. 0.0750
Correct C. 0.100
D. 0.125

Correct Answer: C

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Question 16
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -824.2 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and the s\tandard enthalpy of formation for Fe(s) is 0 kJ/mol.
Correct A. -1859.9 kJ/mol
B. -1879.9 kJ/mol
C. -1899.9 kJ/mol
D. -1919.9 kJ/mol

Correct Answer: A

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Question 17
The atomic radius of an element is 100 pm. If the element is in the 4th period and has an atomic number of 19, what is the expected value of its electronegativity?
A. 0.8
B. 1.2
Correct C. 1.8
D. 2.2

Correct Answer: C

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Question 18
The boiling point of a subs\tance is 100°C. If the subs\tance is a hydrocarbon with the molecular formula C5H12, what is the expected value of its molar entropy?
A. 250 J/mol·K
Correct B. 300 J/mol·K
C. 350 J/mol·K
D. 400 J/mol·K

Correct Answer: B

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Question 19
The s\tandard enthalpy of formation for CO2(g) is -393.5 kJ/mol. If 2.5 mol of CO2(g) is produced at 25°C, what is the expected value of the reaction enthalpy?
Correct A. -987.5 kJ
B. -987.0 kJ
C. -986.5 kJ
D. -986.0 kJ

Correct Answer: A

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Question 20
The s\tandard enthalpy of formation for H2O(l) is -285.8 kJ/mol. If 3.2 mol of H2O(l) is produced at 25°C, what is the expected value of the reaction enthalpy?
Correct A. -918.56 kJ
B. -918.36 kJ
C. -918.16 kJ
D. -917.96 kJ

Correct Answer: A

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Question 21
The molecular formula for a hydrocarbon is C5H12. What is the name of the hydrocarbon?
Correct A. Pen\tane
B. Hexane
C. Hep\tane
D. Oc\tane

Correct Answer: A

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Question 22
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. What is the volume of the gas at 50°C and 2 atm?
Correct A. 1.25 L
B. 2.5 L
C. 5 L
D. 10 L

Correct Answer: A

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Question 23
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 200 g/mol
Correct B. 500 g/mol
C. 1000 g/mol
D. 2000 g/mol

Correct Answer: B

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Question 24
A solution of NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.5 M
C. 1 M
D. 5 M

Correct Answer: B

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Question 25
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. What is the pressure of the gas at 50°C and 2 atm?
A. 2 atm
B. 4 atm
Correct C. 6 atm
D. 8 atm

Correct Answer: C

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