POST UTME AL-HIKMAH UNIVERSITY 2018 Chemistry | Objective

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Question 1
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. Calculate the volume of the gas at a temperature of 400 K.
A. 5 L
B. 10 L
C. 15 L
D. 20 L
Question 2
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 3
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the concentration of HCl after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 4
Determine the oxidation state of nitrogen in the compound NO2.
A. +2
B. +1
C. -1
D. +3
Question 5
Determine the molar mass of a polymer with the following monomer units: CH2=CH-CH3, CH2=CH-CH2-CH3, and CH2=CH-CH2-CH2-CH3. Assume that the polymer has a degree of polymerization of 100.
A. 500 g/mol
B. 750 g/mol
C. 1000 g/mol
D. 1500 g/mol
Question 6
A 2.0 L flask contains 1.0 atm of N2 and 3.0 atm of O2 at 298 K. What is the partial pressure of O2 in the flask?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 7
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH, assuming complete neutralization.
A. 3
B. 7
C. 10
D. 12
Question 8
A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the pH of the solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 9
Determine the number of moles of oxygen gas (O2) required to react with 2.5 moles of hydrogen gas (H2) in the reaction: 2H2 + O2 → 2H2O.
A. 1.25 mol
B. 2.5 mol
C. 3.75 mol
D. 5.0 mol
Question 10
A 2.0 L flask contains 1.0 atm of CO2 at 298 K. What is the partial pressure of CO2 in the flask?
A. 1.0 atm
B. 1.5 atm
C. 2.0 atm
D. 2.5 atm
Question 11
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the addition of 50 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 12
A metal oxide, M2O3, has a molar mass of 200 g/mol. If the metal has an atomic mass of 50 g/mol, what is the percentage of the metal in the oxide?
A. 20%
B. 30%
C. 40%
D. 50%
Question 13
A 10 mL sample of 0.5 M HCl is mixed with 10 mL of 0.5 M NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 14
A metal M has a density of 7.5 g/cm^3. If a 2.5 cm^3 sample of the metal has a mass of 17.5 g, what is the molar mass of the metal?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 15
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. Calculate the pressure of the gas.
A. 10 atm
B. 20 atm
C. 30 atm
D. 40 atm

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