POST UTME ABU 2017 Chemistry | Objective

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Question 1
A 1.00 L flask contains 0.500 mol of an ideal gas at 25°C. What is the volume of the gas at 50°C?
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 2
The energy change (ΔE) for a reaction is given by ΔE = ΔH - TΔS. If ΔH = 50 kJ/mol and ΔS = 0.1 kJ/mol·K, calculate ΔE at 298 K.
A. 40 kJ/mol
B. 50 kJ/mol
C. 60 kJ/mol
D. 70 kJ/mol
Question 3
A 0.500 L flask contains 0.200 mol of O2 gas at 25°C. What is the partial pressure of O2?
A. 0.50 atm
B. 1.00 atm
C. 1.50 atm
D. 2.00 atm
Question 4
A sample of H2 gas has a volume of 1.0 L at a pressure of 1.0 atm and a temperature of 25°C. What is the volume of the gas at a pressure of 2.0 atm and a temperature of 50°C?
A. 0.5 L
B. 1.0 L
C. 1.5 L
D. 2.0 L
Question 5
A solution contains 0.1 M H2SO4 and 0.2 M NaOH. What is the pH of the solution after mixing 50 mL of each solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 6
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. What is the resulting solution?
A. Na2SO4
B. H2O
C. NaHSO4
D. H2SO4
Question 7
A 1.0 M solution of H2SO4 is titrated with 1.0 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, calculate the number of moles of H2SO4.
A. 0.01 mol
B. 0.02 mol
C. 0.03 mol
D. 0.04 mol
Question 8
A 2.00 L flask contains 0.500 mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.00 atm
B. 2.00 atm
C. 3.00 atm
D. 4.00 atm
Question 9
A 2.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1.0 L of water. What is the pH of the solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 10
A solution of 0.100 M NaCl is prepared by dissolving 0.0100 mol of NaCl in 1.00 L of water. What is the concentration of Cl^- ions in the solution?
A. 0.050 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 11
The s\tandard electrode potential (E°) for the reaction 2Ag+ + 2e- → Ag is 0.80 V. Calculate the s\tandard Gibbs free energy change (ΔG°) for this reaction.
A. -1.6 kJ/mol
B. -3.2 kJ/mol
C. -4.8 kJ/mol
D. -6.4 kJ/mol
Question 12
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution
Question 13
A sample of CO2 gas has a volume of 2.5 L at a pressure of 1.0 atm and a temperature of 25°C. What is the volume of the gas at a pressure of 2.0 atm and a temperature of 50°C?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 14
A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the mole \fraction of nitrogen gas?
A. 0.98
B. 0.99
C. 0.995
D. 0.999
Question 15
The molar mass of a compound is 100 g/mol. If 2.5 g of the compound is dissolved in 25 mL of water, what is the concentration of the solution in terms of molarity?
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1 M

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