POST UTME ABU 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.5 M HCl 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 2
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 3
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 4
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 5
A 1.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1.0 L of water. What is the concentration of the solution in terms of molarity?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 6
The diagram below shows a circuit. What is the purpose of the resistor?
A. To reduce the current
B. To increase the voltage
C. To measure the resis\tance
D. To measure the current
Question 7
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 25 mL of HCl is required to reach the equivalence point, calculate the number of moles of NaOH.
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 8
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 9
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 10
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 11
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 12
The s\tandard enthalpy change (ΔH°) for the reaction 2H2 + O2 → 2H2O is 572 kJ/mol. Calculate the s\tandard entropy change (ΔS°) for this reaction.
A. -1.9 kJ/mol·K
B. -2.1 kJ/mol·K
C. -2.3 kJ/mol·K
D. -2.5 kJ/mol·K
Question 13
Determine the number of moles of oxygen gas (O2) that will react with 2.5 moles of carbon monoxide (CO) according to the balanced equation: 2CO + O2 → 2CO2.
A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles
Question 14
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
Question 15
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

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