POST UTME BSU 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of NaOH is mixed with a 2.5 M solution of HCl. What is the resulting pH?
A. 1
B. 7
C. 10
D. 14
Question 2
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -110.6 kJ/mol. What is the equilibrium cons\tant (K) for this reaction?
A. 1.00 × 10^10
B. 1.00 × 10^5
C. 1.00 × 10^2
D. 1.00 × 10^3
Question 3
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 7
C. 10
D. 14
Question 4
A 1 L sample of a 0.5 M solution of H2SO4 is mixed with a 1 L sample of a 0.5 M solution of NaOH. What is the resulting concentration of H2O?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1 M
Question 5
The solubility of a subs\tance in water is 2.5 g/L at 25°C. If 50 mL of water is used to dissolve 1.25 g of the subs\tance, what is the concentration of the solution in g/L?
A. 1.25 g/L
B. 2.5 g/L
C. 5.0 g/L
D. 10.0 g/L
Question 6
A 2.50 L flask contains 0.500 mol of an ideal gas at 25°C. Calculate the pressure of the gas.
A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa
Question 7
A diagram of a titration setup is shown below. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 8
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the solution?
A. 1
B. 7
C. 10
D. 14
Question 9
A 1.0 M solution of a weak base B is titrated with 1.0 M HCl. If the initial pH of the base solution is 10.5, what is the pH of the solution after the addition of 20 mL of HCl?
A. 5.5
B. 6.0
C. 6.5
D. 7.0
Question 10
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 25.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 11
Determine the oxidation state of nitrogen in the compound NO2.
A. +1
B. +2
C. +3
D. +4
Question 12
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 13
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the pH of the solution at the equivalence point?
A. 7
B. 8
C. 9
D. 10
Question 14
Determine the molar solubility of BaSO4 in 0.1 M Na2SO4 solution, given that the solubility product cons\tant (Ksp) for BaSO4 is 1.1 x 10^-10.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M
Question 15
A 25.0 mL sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl present in the sample.
A. 0.0025 mol
B. 0.0050 mol
C. 0.0075 mol
D. 0.0100 mol

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