POST UTME BABCOCK UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The rate cons\tant for a first-order reaction is ______________.
A. k = ln[A]t
B. k = [A]t
C. k = 1/t
D. k = t/[A]
Question 2
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\text{HCl}$ is added to 25.0 mL of 0.100 M $\text{NaOH}$, what is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 3
The boiling point of a solution is 102.5°C. What is the molality of the solution?
A. 200.0
B. 150.0
C. 250.0
D. 300.0
Question 4
A 0.5 M solution of NaOH is mixed with a 0.2 M solution of HCl. Calculate the pH of the resulting solution.
A. 1.3
B. 1.5
C. 1.7
D. 1.9
Question 5
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If the initial pH of the solution is 10 and the final pH after the titration is 7, what is the concentration of the HCl solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
A 2.5 M solution of sulfuric acid (H2SO4) is electrolyzed u\sing a platinum electrode. If the reaction is 50% complete, what is the concentration of sulfuric acid remaining in the solution?
A. 1.25 M
B. 2.5 M
C. 5 M
D. 10 M
Question 7
A 2.50 g sample of a polymer is dissolved in 100.0 mL of solvent. What is the concentration of the polymer in g/L?
A. 25.0
B. 50.0
C. 75.0
D. 100.0
Question 8
A sample of soil is analyzed for its pH and found to have a pH of 6. If the soil is treated with a solution of calcium carbonate (CaCO3) to raise the pH, what is the concentration of the CaCO3 solution needed to raise the pH to 7?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 9
A polymer is formed by the condensation reaction between a diol and a diacid. If the molar mass of the diol is 180 g/mol and the molar mass of the diacid is 150 g/mol, what is the molar mass of the polymer formed?
A. 360 g/mol
B. 420 g/mol
C. 480 g/mol
D. 540 g/mol
Question 10
The atomic radius of an atom is the dis\tance from the nucleus to the outermost electron. If the atomic radius of an atom is 1.5 Å, what is the atomic radius in picometers?
A. 150 pm
B. 200 pm
C. 250 pm
D. 300 pm
Question 11
A metal M has a density of 8.5 g/cm^3 and a molar mass of 120 g/mol. Calculate the number of moles of M present in 25.0 g of the metal.
A. 0.21 mol
B. 0.22 mol
C. 0.23 mol
D. 0.24 mol
Question 12
A sample of air is collected in a container and analyzed for its composition. If the volume of the air sample is 1000 mL and the partial pressure of oxygen (O2) is 0.2 atm, what is the mass of the O2 in the air sample?
A. 0.1 g
B. 0.2 g
C. 0.3 g
D. 0.4 g
Question 13
A 2.5 M solution of sodium hydroxide (NaOH) is electrolyzed u\sing a platinum electrode. If the reaction is 75% complete, what is the concentration of sodium hydroxide remaining in the solution?
A. 0.625 M
B. 1.25 M
C. 2.5 M
D. 5 M
Question 14
The polymerization of styrene to polystyrene is an example of a ______________ reaction.
A. chain reaction
B. step-growth reaction
C. condensation reaction
D. addition reaction
Question 15
The polymerization of styrene to polystyrene involves the addition of a monomer unit to the growing polymer chain. If the initial concentration of styrene is 2.5 M and the reaction is 50% complete, what is the concentration of the monomer unit added to the polymer chain?
A. 1.25 M
B. 2.5 M
C. 5 M
D. 10 M

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