POST UTME UI 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of polymers?
A. They are typically found in nature.
B. They have a high melting point.
C. They are composed of many repeating subunits called monomers.
D. They are typically soluble in water.
Question 2
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, calculate the number of moles of HA present in 100 mL of the acid solution.
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 3
The pH of a 0.1 M solution of a weak acid HA is 4.5. If 10 mL of 1 M NaOH is added to 90 mL of the acid solution, what is the pH of the resulting solution?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 4
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?
A. 1
B. 2
C. 3
D. 4
Question 5
A diagram of a redox reaction is shown below. What is the oxidation state of the oxygen atom in the compound?
A. -2
B. 0
C. +2
D. +4
Question 6
A 10.0 cm³ sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. If 20.0 cm³ of NaOH is required to reach the equivalence point, what is the concentration of the acid?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 7
The solubility of a subs\tance is defined as the _______________________ of the subs\tance in a given solvent at a particular temperature.
A. maximum
B. minimum
C. equilibrium
D. concentration
Question 8
A colloid is a mixture in which the particles are dispersed in a continuous phase. Which of the following is an example of a colloid?
A. Sugar in water
B. Oil in water
C. Smoke in air
D. Dust in air
Question 9
A 2.00 g sample of a subs\tance is placed in a 100.0 mL flask and heated to 100°C. If the pressure of the gas is 1.00 atm, what is the volume of the flask in liters?
A. 0.100 L
B. 0.200 L
C. 0.500 L
D. 1.00 L
Question 10
The reaction of sodium hydroxide with hydrochloric acid to form sodium chloride and water is an example of a(n) _______________________ reaction.
A. neutralization
B. oxidation
C. reduction
D. decomposition
Question 11
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 300 K. Calculate the number of moles of nitrogen gas present in the sample.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 12
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 13
A 15.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 15.0 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 14
A solution of 0.100 M HCl is titrated with 0.100 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl present?
A. 0.00250 mol
B. 0.00500 mol
C. 0.00750 mol
D. 0.0125 mol
Question 15
In a titration experiment, 25.0 cm³ of 0.100 M NaOH is required to neutralize 20.0 cm³ of a weak acid. Calculate the concentration of the acid.
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: