POST UTME ACHIEVERS UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 2
The reaction between H2S and O2 is given by the equation: 2H2S + 3O2 → 2H2O + 2SO3. Calculate the volume of O2 required to react with 2.50 L of H2S at STP.
A. 1.50 L
B. 2.25 L
C. 3.00 L
D. 4.50 L
Question 3
A diagram of a metal oxide is shown below. If the molar mass of the metal oxide is 200 g/mol, what is the molar mass of the metal?
A. 100
B. 150
C. 200
D. 250
Question 4
A diagram of a titration setup is shown below. If 25.0 mL of 0.500 M NaOH is titrated with 0.100 M HCl, what is the pH of the solution at the equivalence point?
A. 7
B. 8
C. 9
D. 10
Question 5
A 1.00 M solution of H2SO4 is mixed with a 1.00 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A 2.50 M solution of HCl is mixed with a 1.00 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 7
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?
A. 0.25 L
B. 0.50 L
C. 0.75 L
D. 1.00 L
Question 8
The rate cons\tant for the decomposition of a compound is 2.5 × 10^\( -3 \) s^\( -1 \). If the initial concentration of the compound is 0.1 M, what is the concentration after 10 minutes?
A. 0.05 M
B. 0.075 M
C. 0.10 M
D. 0.125 M
Question 9
A metal (X) has a density of 11.5 g/cm3 and a molar mass of 55.85 g/mol. What is the atomic radius of X?
A. 1.25 Å
B. 1.50 Å
C. 1.75 Å
D. 2.00 Å
Question 10
A 0.100 M solution of HCl is titrated with a 0.100 M solution of NaOH. If 50.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100 mL
Question 11
A 0.500 M solution of HCl is titrated with a 0.500 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100 mL
Question 12
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 13
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of vaporization of 1.00 mol of H2O(l) at 298 K.
A. -40.7 kJ/mol
B. -41.2 kJ/mol
C. -41.7 kJ/mol
D. -42.2 kJ/mol
Question 14
The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6.
A. -2815 kJ
B. -2835 kJ
C. -2855 kJ
D. -2875 kJ
Question 15
A 50.0 mL sample of 0.100 M NaOH is mixed with a 50.0 mL sample of 0.100 M HCl. What is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.00

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