POST UTME AAUA 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
D. 0.9687 atm
Question 2
In a redox reaction, what is the role of the catalyst in the presence of a strong oxidizing agent?
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
Question 3
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?
A. 1.33
B. 2.00
C. 3.00
D. 4.00
Question 4
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
B. 0.5 M
C. 1 M
D. 5 M
Question 5
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
D. -110.5 kJ/mol
Question 6
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
B. 100 mL
C. 150 mL
D. 200 mL
Question 7
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
B. 50.0 g/mol
C. 60.0 g/mol
D. 70.0 g/mol
Question 8
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
B. 0.05 M
C. 0.2 M
D. 0.05 M
Question 9
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
B. 1.2 V
C. 1.8 V
D. 2.5 V
Question 10
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
D. 0.9687 atm
Question 11
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
B. 0.500 cm3
C. 1.00 cm3
D. 2.00 cm3
Question 12
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
D. 2.00
Question 13
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
B. 2
C. 3
D. 4
Question 14
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).
A. -110.5 kJ/mol
B. -110.8 kJ/mol
C. -110.2 kJ/mol
D. -110.9 kJ/mol
Question 15
The solubility of AgCl in water is 1.8 × 10^\( -5 \) mol/L. Calculate the molar solubility of AgCl.
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

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