POST UTME UNN 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a chromatography setup is shown below. If the retention time of a particular compound is 15 minutes, what is the concentration of the compound in the sample?
A. 0.1 mg/mL
B. 0.5 mg/mL
C. 1.0 mg/mL
D. 5.0 mg/mL
Question 2
A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required?
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 3
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 4
The diagram below represents a titration setup. What is the purpose of the burette in this setup?
A. To measure the volume of the solution
B. To measure the concentration of the solution
C. To mix the solutions
D. To separate the solutions
Question 5
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 300 K. What is the new volume of the gas if the pressure is increased to 3.0 atm and the temperature is decreased to 200 K?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 6
The reaction of sodium with water is represented by the equation: 2Na + 2H2O → 2NaOH + H2. What is the oxidation state of sodium in NaOH?
A. +1
B. +2
C. +3
D. +4
Question 7
A 2.0 g sample of a polymer is dissolved in 100 mL of solvent. If the density of the solution is 1.2 g/mL, what is the molar mass of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 8
A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and CO2 gas. If the metal oxide has a molar mass of 100 g/mol and the CO2 gas has a molar mass of 44 g/mol, what is the molar mass of the metal carbonate?
A. 150
B. 200
C. 250
D. 300
Question 9
A metal M reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2M2O3. What is the oxidation state of M in the product?
A. +3
B. +2
C. +1
D. -2
Question 10
A 2.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. What is the resulting concentration of the solution after the reaction is complete?
A. 1.00 M
B. 1.50 M
C. 2.00 M
D. 3.00 M
Question 11
A sample of water is contaminated with a certain amount of sulfuric acid. The pH of the solution is 2.5. What is the concentration of the sulfuric acid in the solution?
A. 0.01 M
B. 0.1 M
C. 1 M
D. 10 M
Question 12
A 2.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. What is the resulting concentration of the solution after the reaction is complete?
A. 1.00 M
B. 1.50 M
C. 2.00 M
D. 3.00 M
Question 13
The diagram below shows a circuit. Identify the component labeled A.
A. Resistor
B. Battery
C. Capacitor
D. Inductor
Question 14
A 25 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 15
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. Acid
B. Base
C. Salt
D. Water

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: