POST UTME IMS U 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will be left after 15 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 2
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 3
A 2.0 g sample of a metal hydroxide is dissolved in water to produce a solution with a pH of 10. If the molar mass of the metal hydroxide is 80 g/mol, what is the concentration of the metal hydroxide in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?
A. Oxygen gas
B. Copper metal
C. Hydrogen gas
D. Sulfuric acid
Question 5
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 6
What is the major product of the reaction between ethene and bromine?
A. 1,2-dibromoethane
B. 1,1-dibromoethane
C. 1,3-dibromoethane
D. 1,4-dibromoethane
Question 7
A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the metal oxide has a molar mass of 120 g/mol and the reaction is 100% efficient, what is the mass of the metal oxide produced?
A. 1.2 g
B. 1.5 g
C. 1.8 g
D. 2.0 g
Question 8
A 2.5 M solution of HCl is titrated with a 0.5 M solution of NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 9
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If the initial concentrations of H+ and OH- ions are 1.0 M each, what is the pH of the resulting solution?
A. 0
B. 1
C. 2
D. 3
Question 10
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpies of formation for the reac\tants and products are: ΔHf(Al(s)) = -1261 kJ/mol, ΔHf(Fe2O3(s)) = -826 kJ/mol, ΔHf(Fe(s)) = 0 kJ/mol, and ΔHf(Al2O3(s)) = -1676 kJ/mol.
A. -1454 kJ/mol
B. -1754 kJ/mol
C. -1654 kJ/mol
D. -1554 kJ/mol
Question 11
Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess oxygen according to the equation: C6H12O6 + 6O2 → 6CO2 + 6H2O. The molar mass of C6H12O6 is 180 g/mol.
A. 0.025 mol
B. 0.05 mol
C. 0.075 mol
D. 0.1 mol
Question 12
A 0.1 M solution of AgNO3 is mixed with a 0.1 M solution of NaCl. If the initial concentrations of Ag+ and Cl- ions are 0.1 M each, what is the concentration of AgCl formed after the reaction is complete?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 13
A solution contains 0.1 M H2SO4 and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 14
A sample of a compound with the molecular formula C2H4O2 is analyzed by GC-MS and found to have a molecular ion peak at m/z 60. What is the structure of the compound?
A. CH3COCH3
B. CH3COOH
C. CH3CH2OH
D. CH3COOCH3
Question 15
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. If the initial concentrations of OH- and H+ ions are 1.0 M each, what is the concentration of NaCl formed after the reaction is complete?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

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