POST UTME AAUA 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
B. 2
C. 3
D. 4
Question 2
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
D. 2.00
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
B. 1.00 M
C. 2.00 M
D. 5.00 M
Question 4
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).
A. -1207.5 kJ/mol
B. -1207.8 kJ/mol
C. -1207.2 kJ/mol
D. -1207.9 kJ/mol
Question 5
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 6
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 7
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 8
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 9
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
Question 10
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 11
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 12
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
C. 6.00 atm
D. 8.00 atm
Question 13
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 14
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 15
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

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