POST UTME IGBINEDION UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The compound with the molecular formula C2H6O is a derivative of which of the following alcohols?
A. methanol
B. ethanol
C. propanol
D. bu\tanol
Question 2
A 5.0 L flask contains 0.25 M NaOH. What is the number of moles of NaOH in the flask?
A. 0.25 mol
B. 0.50 mol
C. 0.75 mol
D. 1.0 mol
Question 3
The reaction 2Ag+(aq) + Cr(s) → 2Ag(s) + Cr2+(aq) is an example of a redox reaction. What is the oxidation state of chromium in the reac\tant and product?
A. 0 in reac\tant, +2 in product
B. +2 in reac\tant, 0 in product
C. +3 in reac\tant, +2 in product
D. -2 in reac\tant, +2 in product
Question 4
A metal M reacts with chlorine gas to form a compound MCl2. The molar mass of MCl2 is 142 g/mol. What is the molar mass of metal M?
A. 50 g/mol
B. 60 g/mol
C. 70 g/mol
D. 80 g/mol
Question 5
A sample of CO2 is collected over water and has a volume of 2.50 L at 25.0°C and 1.00 atm. What is the partial pressure of CO2?
A. 0.500 atm
B. 0.750 atm
C. 1.00 atm
D. 1.25 atm
Question 6
A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.5 grams of the polymer are dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.5 g/L
C. 5 g/L
D. 50 g/L
Question 7
The compound with the molecular formula C4H8O2 is a derivative of which of the following alcohols?
A. ethanol
B. propanol
C. bu\tanol
D. pen\tanol
Question 8
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,2-dibromocyclohexane
Question 9
A metal oxide, M2O3, reacts with a strong acid, HCl, to form a salt and water. If 2.50 g of M2O3 reacts with 2.00 M HCl to produce 1.50 g of salt, what is the molar mass of M2O3?
A. 150 g/mol
B. 200 g/mol
C. 250 g/mol
D. 300 g/mol
Question 10
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 11
The half-life of a radioactive subs\tance is 5.0 years. If 100.0 g of the subs\tance is initially present, what is the mass of the subs\tance remaining after 10.0 years?
A. 12.5 g
B. 25.0 g
C. 50.0 g
D. 100.0 g
Question 12
A 2.50 g sample of a polymer is dissolved in 100 mL of a solvent. If the density of the solution is 1.05 g/mL, what is the molar mass of the polymer?
A. 1000 g/mol
B. 5000 g/mol
C. 20000 g/mol
D. 50000 g/mol
Question 13
The polymerization of styrene to polystyrene is an example of a step-growth polymerization. What is the monomer unit of polystyrene?
A. CH2=CHPh
B. CH2=CHCH3
C. CH2=CHCOOH
D. CH2=CHCN
Question 14
A 2.0 L flask contains 0.50 M H2SO4. What is the number of moles of H2SO4 in the flask?
A. 0.25 mol
B. 0.50 mol
C. 0.75 mol
D. 1.0 mol
Question 15
A 2.0 L flask contains 0.50 M H2SO4. What is the concentration of hydrogen ions \( H+ \) in the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.0 M

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