POST UTME ACHIEVERS UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 2
A 4.0 M solution of sodium hydroxide (NaOH) is prepared by dissolving 4.0 g of NaOH in 100 mL of water. What is the molarity of the solution?
A. 0.4 M
B. 1.0 M
C. 4.0 M
D. 10.0 M
Question 3
The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much will remain after 20 days?
A. 50 mg
B. 25 mg
C. 12.5 mg
D. 6.25 mg
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. -1206.5 kJ/mol
B. -393.5 kJ/mol
C. 393.5 kJ/mol
D. 1206.5 kJ/mol
Question 5
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -181.6 kJ/mol. What is the equilibrium cons\tant (K) for this reaction?
A. 1.00 x 10^5
B. 1.00 x 10^3
C. 1.00 x 10^2
D. 1.00 x 10^1
Question 6
A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the number of moles of NaOH required.
A. 0.0025
B. 0.005
C. 0.0075
D. 0.01
Question 7
Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^-10.
A. 1.0 × 10^-5 M
B. 2.0 × 10^-5 M
C. 3.0 × 10^-5 M
D. 4.0 × 10^-5 M
Question 8
The diagram below shows a titration setup.
A. The burette contains HCl.
B. The beaker contains NaOH.
C. The burette contains NaOH.
D. The beaker contains HCl.
Question 9
Determine the concentration of a 0.5 M solution of NaOH in g/L, given that the molar mass of NaOH is 40 g/mol.
A. 20 g/L
B. 40 g/L
C. 60 g/L
D. 80 g/L
Question 10
A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 11
The diagram below shows a molecular structure. What is the type of bond between the two carbon atoms?
A. Sigma bond
B. Pi bond
C. Sigma and pi bond
D. No bond
Question 12
A 25 mL sample of 0.1 M HCl is mixed with 25 mL of 0.1 M NaOH. Calculate the pH of the resulting solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 13
A 2.5 M solution of calcium chloride (CaCl2) is prepared by dissolving 1.25 g of CaCl2 in 100 mL of water. What is the molarity of the solution?
A. 2.5 M
B. 1.25 M
C. 5.0 M
D. 10.0 M
Question 14
A 2.5 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 2.5 M
Question 15
The diagram below shows a titration setup.
A. The burette contains HCl.
B. The beaker contains NaOH.
C. The burette contains NaOH.
D. The beaker contains HCl.

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