POST UTME EKSU 2020 Chemistry | Objective

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Question 1
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 2
A polymer sample is analyzed u\sing gel permeation chromatography (GPC). The chromatogram shows a peak at 10 minutes with a retention volume of 20 mL. Calculate the molecular weight of the polymer, assuming a calibration curve with a slope of 1.00 mL/min.
A. 10^4 g/mol
B. 10^5 g/mol
C. 10^6 g/mol
D. 10^7 g/mol
Question 3
A sample of a gas occupies 2.50 L at 25.0°C and 1.00 atm. What is the volume of the gas at 50.0°C and 2.00 atm?
A. 3.00 L
B. 3.50 L
C. 4.00 L
D. 4.50 L
Question 4
A diagram of a redox reaction is shown below. If 10 mL of 0.1 M FeCl3 is added to 10 mL of 0.1 M NaOH, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 5
A 2.5 M solution of ΔFeClγ is electrolyzed u\sing a platinum electrode. Calculate the mass of ΔFe deposited after 2 hours, given that the current density is 10 A/m² and the electrode area is 0.05 m².
A. 0.25 g
B. 0.50 g
C. 0.75 g
D. 1.0 g
Question 6
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after adding 10 mL of 0.1 M HCl?
A. 1
B. 2
C. 3
D. 4
Question 7
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the number of moles of H2SO4.
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 8
A 250 mL sample of a 0.5 M solution of sodium chloride (NaCl) is mixed with 500 mL of a 0.2 M solution of calcium chloride (CaCl2). What is the concentration of the resulting solution?
A. 0.35 M
B. 0.45 M
C. 0.25 M
D. 0.30 M
Question 9
A 1.0 L sample of a solution containing 0.1 M NaCl is mixed with 1.0 L of a solution containing 0.2 M NaOH. Calculate the concentration of the resulting solution.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 10
A solution contains 0.100 M NaCl. What is the concentration of Cl- ions in the solution?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 11
The s\tandard enthalpy of formation (ΔHf°) for H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy change (ΔH°) for the reaction: H2(g) + 1/2O2(g) → H2O(l).
A. -285.8 kJ/mol
B. -286.2 kJ/mol
C. -286.5 kJ/mol
D. -286.0 kJ/mol
Question 12
A 2.5 M solution of 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 13
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Erlenmeyer Flask
Question 14
The s\tandard enthalpy of formation of ΔFe(OH)γ is -826.4 kJ/mol. Calculate the s\tandard Gibbs free energy of formation of ΔFe(OH)γ at 298 K.
A. -826.4 kJ/mol
B. -826.4 kJ/mol + 298 J/mol
C. -826.4 kJ/mol - 298 J/mol
D. -826.4 kJ/mol + 298 kJ/mol
Question 15
A sample of nitrogen gas (N2) occupies a volume of 2.5 L at a pressure of 1 atm and a temperature of 298 K. Calculate the number of moles of N2 present.
A. 0.1 mol
B. 0.2 mol
C. 0.3 mol
D. 0.4 mol

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