POST UTME CALEB UNIVERSITY 2019 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 2019 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.
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 2
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and that of O2(g) is 0 kJ/mol.
A. -285.8 kJ/mol
Correct B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -483.5 kJ/mol

Correct Answer: B

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Question 3
A 2.5 g sample of a non-metallic oxide is dissolved in 50 mL of 0.1 M HCl. The resulting solution is then titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the oxide?
A. 50 g/mol
Correct B. 100 g/mol
C. 150 g/mol
D. 200 g/mol

Correct Answer: B

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Question 4
A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
Correct A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M

Correct Answer: A

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Question 5
A 2.0 g sample of a metal is dissolved in 50 mL of 0.1 M HCl. The resulting solution is then titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the molar mass of the metal?
A. 50 g/mol
Correct B. 100 g/mol
C. 150 g/mol
D. 200 g/mol

Correct Answer: B

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Question 6
Determine the s\tandard enthalpy of formation of CH4(g) from the following data: ΔHf(H2(g)) = -241.8 kJ/mol, ΔHf(C(s)) = -393.5 kJ/mol, ΔHf(CH4(g)) = -74.8 kJ/mol.
Correct A. -50.5 kJ/mol
B. -74.8 kJ/mol
C. -100.3 kJ/mol
D. -124.9 kJ/mol

Correct Answer: A

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Question 7
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the pH of the solution after 10.0 mL of HCl has been added.
A. 2.00
Correct B. 2.50
C. 3.00
D. 3.50

Correct Answer: B

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Question 8
The rate cons\tant for a first-order reaction is 1.5 min^-1. If the initial concentration of the reac\tant is 0.200 M, what is the concentration after 10.0 min?
Correct A. 0.100 M
B. 0.150 M
C. 0.200 M
D. 0.250 M

Correct Answer: A

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Question 9
A metal M has a s\tandard reduction potential of -0.80 V. What is the s\tandard cell potential for the reaction: M^2+ + 2e^- → M?
A. -0.80 V
B. -0.60 V
C. -0.40 V
Correct D. -0.20 V

Correct Answer: D

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Question 10
A 10.0 g sample of a metal oxide is heated in a crucible until it decomposes completely. If 5.00 g of the metal is obtained, what is the empirical formula of the metal oxide?
A. M2O3
Correct B. M2O5
C. M3O4
D. M4O6

Correct Answer: B

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Question 11
A certain metal M has a s\tandard electrode potential of +0.5 V. If a cell is constructed with M as the anode and a s\tandard hydrogen electrode as the cathode, what is the s\tandard cell potential of the cell?
A. 0.5 V
Correct B. -0.5 V
C. +1.0 V
D. -1.0 V

Correct Answer: B

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Question 12
A solution of NaCl is electrolyzed u\sing a current of 2.5 A for 2 hours. If the molar mass of NaCl is 58.5 g/mol, what is the mass of NaCl deposited at the cathode?
A. 1.5 g
Correct B. 3.0 g
C. 4.5 g
D. 6.0 g

Correct Answer: B

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Question 13
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 M
Correct B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: B

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Question 14
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?
A. 1.0
B. 2.0
Correct C. 3.0
D. 4.0

Correct Answer: C

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Question 15
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the mole \fraction of CO2?
A. 0.98
B. 0.99
Correct C. 0.995
D. 0.996

Correct Answer: C

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Question 16
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is added, what is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
Correct D. 4.0

Correct Answer: D

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Question 17
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining?
A. 1.8 M
Correct B. 1.9 M
C. 2.0 M
D. 2.1 M

Correct Answer: B

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Question 18
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the mole \fraction of CO2?
A. 0.98
B. 0.99
Correct C. 0.995
D. 0.996

Correct Answer: C

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Question 19
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is added, what is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
Correct D. 4.0

Correct Answer: D

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Question 20
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining?
A. 1.8 M
Correct B. 1.9 M
C. 2.0 M
D. 2.1 M

Correct Answer: B

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Question 21
The solubility of a gas in a liquid is influenced by the following factors: (i) temperature, (ii) pressure, (iii) surface tension, and (iv) polarity of the solvent. Arrange these factors in order of their relative impor\tance in increa\sing the solubility of a gas in a liquid.
Correct A. Temperature, Pressure, Surface Tension, Polarity
B. Temperature, Polarity, Pressure, Surface Tension
C. Pressure, Temperature, Polarity, Surface Tension
D. Polarity, Temperature, Pressure, Surface Tension

Correct Answer: A

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Question 22
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?
A. +3
Correct B. +5
C. +7
D. +9

Correct Answer: B

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Question 23
A 2.5 M solution of sodium hydroxide is prepared by dissolving 12.5 g of NaOH in water to make 1 L of solution. What is the pH of the solution?
A. 12
B. 13
Correct C. 14
D. 15

Correct Answer: C

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Question 24
The diagram below shows a setup for the electrolysis of water.
A. The anode is the cathode
Correct B. The cathode is the anode
C. The electrolyte is water
D. The electrolyte is a strong acid

Correct Answer: B

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Question 25
The atomic radius of an element is 100 pm. What is the expected atomic radius of its isotope with mass number 120?
A. 110 pm
B. 120 pm
Correct C. 130 pm
D. 140 pm

Correct Answer: C

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