POST UTME AAUA 2017 Chemistry | Objective

Are you preparing for POST UTME AAUA exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. What is the ratio of the final pressure to the initial pressure?
Correct A. 1.33
B. 2.00
C. 3.00
D. 4.00

Correct Answer: A

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Question 2
A metal oxide has the formula M2O3. If 2.50 g of the oxide contains 0.750 g of oxygen, what is the molar mass of the metal (M)?
A. 40.0 g/mol
Correct B. 50.0 g/mol
C. 60.0 g/mol
D. 70.0 g/mol

Correct Answer: B

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Question 3
A solution contains 5.00 g of glu\cose (C6H12O6) per 100.0 mL of solution. What is the molarity of the solution?
A. 0.500 M
Correct B. 1.00 M
C. 2.00 M
D. 5.00 M

Correct Answer: B

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Question 4
A 2.50-L sample of a gas at 25°C and 1.00 atm is compressed to 0.500 L at 50°C. What is the final pressure of the gas?
A. 2.00 atm
B. 4.00 atm
Correct C. 6.00 atm
D. 8.00 atm

Correct Answer: C

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Question 5
A metal has a density of 9.00 g/cm3 and a molar mass of 60.0 g/mol. What is the volume of 2.50 g of the metal?
A. 0.250 cm3
Correct B. 0.500 cm3
C. 1.00 cm3
D. 2.00 cm3

Correct Answer: B

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Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1207.5 kJ/mol
B. -1207.8 kJ/mol
C. -1207.2 kJ/mol
D. -1207.9 kJ/mol

Correct Answer: A

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Question 7
A 2.5 M solution of NaOH is mixed with a 2.5 M solution of HCl. Calculate the pH of the resulting solution.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 8
The solubility of AgCl in water is 1.8 × 10^\( -5 \) mol/L. Calculate the molar solubility of AgCl.
Correct A. 1.8 × 10^\( -5 \) mol/L
B. 1.8 × 10^\( -4 \) mol/L
C. 1.8 × 10^\( -6 \) mol/L
D. 1.8 × 10^\( -3 \) mol/L

Correct Answer: A

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Question 9
A 100 mL sample of a 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 50 mL
Correct B. 100 mL
C. 150 mL
D. 200 mL

Correct Answer: B

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Question 10
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) u\sing the following reaction: C(s) + O2(g) → CO(g).
Correct A. -110.5 kJ/mol
B. -110.8 kJ/mol
C. -110.2 kJ/mol
D. -110.9 kJ/mol

Correct Answer: A

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Question 11
In a redox reaction, what is the role of the catalyst in the presence of a strong oxidizing agent?
Correct A. To reduce the activation energy of the reaction
B. To increase the rate of reaction
C. To stabilize the intermediate species
D. To prevent the formation of side products

Correct Answer: A

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Question 12
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the concentration of the resulting solution?
A. 0.1 M
Correct B. 0.05 M
C. 0.2 M
D. 0.05 M

Correct Answer: B

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Question 13
A polymer has a molecular weight of 50000 g/mol. If 1 g of the polymer is dissolved in 100 mL of solvent, what is the concentration 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 14
A cell has an emf of 1.5 V and an internal resis\tance of 0.5 ohms. If a current of 2 A is drawn from the cell, what is the potential difference across the terminals?
A. 1.5 V
Correct B. 1.2 V
C. 1.8 V
D. 2.5 V

Correct Answer: B

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Question 15
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 16
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
Correct D. -110.5 kJ/mol

Correct Answer: D

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Question 17
A 0.500 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 2.00
B. 2.00
C. 2.00
Correct D. 2.00

Correct Answer: D

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Question 18
A sample of CO2 gas is collected over water at a temperature of 25.0°C and a pressure of 1.00 atm. If the vapor pressure of water at 25.0°C is 0.0313 atm, what is the partial pressure of CO2?
A. 0.9687 atm
B. 0.9687 atm
C. 0.9687 atm
Correct D. 0.9687 atm

Correct Answer: D

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Question 19
A 2.00 M solution of H2SO4 is titrated with 2.00 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?
A. 2.00
B. 2.00
C. 2.00
Correct D. 2.00

Correct Answer: D

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Question 20
A sample of H2 gas is collected over water at a temperature of 25.0°C and a pressure of 1.00 atm. If the vapor pressure of water at 25.0°C is 0.0313 atm, what is the partial pressure of H2?
A. 0.9687 atm
B. 0.9687 atm
C. 0.9687 atm
Correct D. 0.9687 atm

Correct Answer: D

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