POST UTME BSU 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50 L sample of a gas at 27°C and 1.00 atm is collected over water. If the vapor pressure of water at 27°C is 0.0313 atm, calculate the partial pressure of the gas.
A. 0.968 atm
B. 1.00 atm
C. 1.03 atm
D. 1.05 atm
Question 2
A 2.00-g sample of a subs\tance is dissolved in 25.0 mL of a solvent. If the molar mass of the subs\tance is 200 g/mol, what is the concentration of the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 3
A diagram of a titration setup is shown below. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 4
A metal has a density of 8.5 g/cm^3 and a molar mass of 50 g/mol. What is the volume of 1 mole of the metal?
A. 0.1 L
B. 0.5 L
C. 1.0 L
D. 5.0 L
Question 5
Determine the oxidation state of nitrogen in the compound NO2.
A. +1
B. +2
C. +3
D. +4
Question 6
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. 500 g/mol
D. 1000 g/mol
Question 7
A gas has a volume of 2.5 L at a pressure of 1.5 atm. What is the volume of the gas at a pressure of 3.0 atm?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 8
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the solution?
A. 1
B. 7
C. 10
D. 14
Question 9
A reaction is represented by the equation: 2A + B → C + 3D. If 2.00 mol of A and 1.50 mol of B are present, what is the limiting reac\tant?
A. A
B. B
C. C
D. D
Question 10
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 25.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 11
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 12
A 1 L sample of a 0.5 M solution of H2SO4 is mixed with a 1 L sample of a 0.5 M solution of NaOH. What is the resulting concentration of H2O?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1 M
Question 13
A solution of 0.10 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 14
A 1.0 M solution of a weak base B is titrated with 1.0 M HCl. If the initial pH of the base solution is 10.5, what is the pH of the solution after the addition of 20 mL of HCl?
A. 5.5
B. 6.0
C. 6.5
D. 7.0
Question 15
A solution contains 0.100 M HCl and 0.0500 M NaOH. What is the pH of the resulting solution?
A. 2.00
B. 3.00
C. 4.00
D. 5.00

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