POST UTME SKYLINE UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 200 g/mol
B. 400 g/mol
C. 600 g/mol
D. 800 g/mol
Question 2
A solution of NaOH is 0.1 M. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 3
A solution of silver nitrate is added to a solution of sodium chloride. What is the resulting precipitate?
A. AgCl
B. NaNO3
C. Ag2Cl2
D. NaCl
Question 4
What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10^-3 M?
A. 1
B. 2
C. 3
D. 4
Question 5
A 0.1 M solution of sodium carbonate (Na2CO3) is prepared by dissolving 2.5 g of the salt in 100 mL of water. What is the concentration of carbonate ions \( CO32- \) in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M
Question 6
A gas occupies a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 25.0°C. What is the volume of the gas at a pressure of 2.00 atm and a temperature of 50.0°C?
A. 3.00 L
B. 4.00 L
C. 5.00 L
D. 6.00 L
Question 7
A metal (M) has a density of 8.00 g/cm^3 and a molar mass of 100 g/mol. What is the volume of 25.0 g of the metal?
A. 2.50 cm^3
B. 5.00 cm^3
C. 10.0 cm^3
D. 20.0 cm^3
Question 8
A 25 mL sample of a polymer solution is titrated with 0.1 M NaOH. The initial pH of the solution is 3.5. After the addition of 10 mL of NaOH, the pH increases to 4.5. Calculate the molar mass of the polymer.
A. 500 g/mol
B. 1000 g/mol
C. 2000 g/mol
D. 5000 g/mol
Question 9
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 200 g/mol
B. 400 g/mol
C. 600 g/mol
D. 800 g/mol
Question 10
A solution of HCl is 0.1 M. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 11
A diagram of a metal alloy is shown below. If the composition of the alloy is 75% copper and 25% zinc, calculate the mass of copper in a 100 g sample of the alloy.
A. 50 g
B. 60 g
C. 70 g
D. 80 g
Question 12
A gas occupies a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 25.0°C. What is the pressure of the gas at a volume of 5.00 L and a temperature of 50.0°C?
A. 1.00 atm
B. 2.00 atm
C. 3.00 atm
D. 4.00 atm
Question 13
A sample of air is collected over water and found to have a partial pressure of oxygen of 0.21 atm. What is the percentage of oxygen in the air?
A. 20%
B. 21%
C. 22%
D. 23%
Question 14
A solution of 0.1 M acetic acid (CH3COOH) is prepared by dissolving 2.5 g of the acid in 100 mL of water. What is the pH of the solution?
A. 2
B. 3
C. 4
D. 5
Question 15
The rate cons\tant of a first-order reaction is 0.05 min^{-1}. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.05 M
B. 0.025 M
C. 0.05 M
D. 0.1 M

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