POST UTME AAUA 2021 Chemistry | Objective
Practice these randomly selected questions to test your readiness.
Question 1
The s\tandard Gibbs free energy change (ΔG°) for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s) is -1340.6 kJ/mol. Calculate the equilibrium cons\tant (K) for the reaction.
Question 2
A sample of a metal has a density of 8.0 g/cm^3. If the volume of the sample is 2.0 cm^3, what is the mass of the sample?
Question 3
The diagram below shows the titration of 25 mL of 0.1 M HCl with 0.1 M NaOH. If the initial pH of the solution is 2.0, what is the pH of the solution after the addition of 25 mL of 0.1 M NaOH?
Question 4
A 10 L solution of 0.1 M HCl is mixed with 10 L of 0.1 M NaOH. Calculate the pH of the resulting solution.
Question 5
The diagram below shows the structure of a hydrocarbon molecule. Identify the type of hydrocarbon.
Question 6
Determine the number of moles of oxygen gas (O2) produced at s\tandard temperature and pressure (STP) when 2.5 moles of carbon monoxide (CO) react with excess oxygen according to the equation: 2CO + O2 → 2CO2.
Question 7
A 0.500 M solution of NaOH is mixed with 0.500 M solution of HCl. What is the pH of the resulting solution?
Question 8
Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s) given that the s\tandard enthalpy of formation (ΔHf°) for Al2O3(s) is -1675.7 kJ/mol, Al(s) is -1269.6 kJ/mol, Fe2O3(s) is -826.4 kJ/mol, and Fe(s) is 0 kJ/mol.
Question 9
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.0500 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
Question 10
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
Question 11
In a titration experiment, 25.0 mL of 0.100 M NaOH is added to 20.0 mL of 0.0500 M HCl. What is the concentration of the HCl solution if the equivalence point is reached at 35.0 mL of NaOH?
Question 12
A 2.00 M solution of HCl is mixed with a 2.00 M solution of NaOH. What is the resulting concentration of HCl?
Question 13
A 1.00 L sample of 0.100 M HCl is mixed with a 1.00 L sample of 0.100 M NaOH. Calculate the pH of the resulting solution.
Question 14
A solution containing 0.500 M CaCl2 is mixed with a solution containing 0.750 M Na2SO4. Calculate the concentration of the resulting solution.
Question 15
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is: CaO(s) + CO2(g) → CaCO3(s).
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.
Unlock Full Access
Available for Android & Windows