POST UTME UI 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction 2CH4(g) + 3O2(g) → 2CO2(g) + 4H2O(g) has a rate cons\tant of 0.01 L mol^-1 s^-1. If the initial concentrations of CH4 and O2 are 0.05 M and 0.1 M, respectively, what is the rate of reaction after 25 seconds?
A. 0.0002 M s^-1
B. 0.002 M s^-1
C. 0.01 M s^-1
D. 0.1 M s^-1
Question 2
A 0.5 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1 L of water. What is the concentration of OH- ions in the solution?
A. 0.5 M
B. 0.25 M
C. 0.1 M
D. 0.05 M
Question 3
Identify the type of reaction that occurs when ethanol (C2H5OH) reacts with HCl.
A. Synthesis
B. Decomposition
C. Substitution
D. Elimination
Question 4
A metal M reacts with chlorine gas to form a white solid MX. The molar mass of M is 55.85 g/mol, and the molar mass of Cl2 is 70.90 g/mol. What is the molar mass of MX?
A. 125.75 g/mol
B. 126.75 g/mol
C. 127.75 g/mol
D. 128.75 g/mol
Question 5
The reaction 2NH3(g) + 3O2(g) → 2NO(g) + 3H2O(g) has a rate cons\tant of 0.01 L mol^-1 s^-1. If the initial concentrations of NH3 and O2 are 0.05 M and 0.1 M, respectively, what is the rate of reaction after 20 seconds?
A. 0.0001 M s^-1
B. 0.001 M s^-1
C. 0.01 M s^-1
D. 0.1 M s^-1
Question 6
A 2.5 L sample of a gas at 27°C and 1.5 atm is compressed to 0.5 L at the same temperature. What is the new pressure of the gas?
A. 6.0 atm
B. 7.5 atm
C. 9.0 atm
D. 10.5 atm
Question 7
A 2.0 L sample of a gas at 27°C and 1.5 atm is compressed to 0.5 L at the same temperature. What is the new pressure of the gas?
A. 6.0 atm
B. 7.5 atm
C. 9.0 atm
D. 10.5 atm
Question 8
Calculate the number of moles of NaOH required to react with 250 mL of 0.5 M HCl.
A. 0.125
B. 0.25
C. 0.5
D. 1
Question 9
The reaction of a hydrocarbon with chlorine gas produces a dichloroalkane. If the molecular weight of the hydrocarbon is 120 g/mol and the molecular weight of the dichloroalkane is 200 g/mol, what is the molecular weight of the chlorine gas used?
A. 80 g/mol
B. 90 g/mol
C. 100 g/mol
D. 110 g/mol
Question 10
The reaction of a hydrocarbon with chlorine gas produces a dichloroalkane. If the molecular weight of the hydrocarbon is 120 g/mol and the molecular weight of the dichloroalkane is 200 g/mol, what is the molecular weight of the chlorine gas used?
A. 80 g/mol
B. 90 g/mol
C. 100 g/mol
D. 110 g/mol
Question 11
A solution of a weak acid is prepared by dissolving 25 g of the acid in 100 mL of water. What is the concentration of the acid in the solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 12
The following diagram shows a setup for the extraction of a metal from its ore. What is the purpose of the electrolyte in the cell?
A. To conduct electricity
B. To purify the metal
C. To increase the temperature
D. To decrease the pressure
Question 13
The diagram below shows a titration setup. What is the purpose of the burette?
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 14
The solubility product cons\tant (Ksp) of AgCl is 1.8 x 10^-10. Calculate the molar solubility of AgCl.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M
Question 15
A 2 M solution of HCl is prepared by dissolving 40 g of HCl in 1 L of water. What is the concentration of H+ ions in the solution?
A. 2 M
B. 1 M
C. 0.5 M
D. 0.25 M

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