POST UTME LAUTECH 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5g sample of a subs\tance is found to have a mass of 3.2g after being heated in a crucible. What is the mass of the subs\tance that was lost during heating?
A. 0.7g
B. 1.2g
C. 1.7g
D. 2.2g
Question 2
A 5.0L container is filled with 2.0mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.0atm
B. 1.5atm
C. 2.0atm
D. 2.5atm
Question 3
A diagram of a gas collection apparatus is shown below. What is the purpose of the gas collection tube in the apparatus?
A. To collect the gas produced.
B. To measure the volume of the gas produced.
C. To mix the gas with another gas.
D. To measure the pH of the solution.
Question 4
A sample of a non-metallic element is heated in a crucible. What is the expected change in the element's properties?
A. The element sublimes and its color changes.
B. The element melts and its color remains the same.
C. The element sublimes and its color remains the same.
D. The element melts and its color changes.
Question 5
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 6
A sample of N2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of N2 is 0.75 atm, what is the mole \fraction of N2 in the gas mixture?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 7
A diagram of a titration apparatus is shown below. What is the purpose of the burette in the apparatus?
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 measure the pH of the solution.
Question 8
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 9
A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the pH of the solution after 5 mL of NaOH has been added.
A. 1
B. 2
C. 3
D. 4
Question 10
A 25 mL sample of 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 11
A 1.0 M solution of H2SO4 is titrated with 0.5 M NaOH. If 30 mL of H2SO4 is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 15 mL
B. 30 mL
C. 45 mL
D. 60 mL
Question 12
A 10.0g sample of a subs\tance is found to have a mass of 8.0g after being heated in a crucible. What is the mass of the subs\tance that was lost during heating?
A. 1.0g
B. 2.0g
C. 3.0g
D. 4.0g
Question 13
A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.75 atm, what is the mole \fraction of CO2 in the gas mixture?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 14
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the resulting concentration of HCl after the reaction is complete?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 15
In the electrolysis of water, what is the primary product at the cathode?
A. O2
B. H2
C. OH-
D. H+

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: