POST UTME KSU 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a hydrocarbon has the molecular formula C5H12. What is the name of the hydrocarbon?
A. Pen\tane
B. Hexane
C. Hep\tane
D. Oc\tane
Question 2
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added. The initial volume of the HCl solution is 50 mL.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 3
The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100g, what is the amount remaining after 10 years?
A. 12.5g
B. 25g
C. 50g
D. 100g
Question 4
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 5
A 2.50 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 11.2 kJ of heat energy. If the molar mass of the hydrocarbon is 42.0 g/mol, calculate the s\tandard enthalpy of combustion per mole of the hydrocarbon.
A. -88.0 kJ/mol
B. -92.0 kJ/mol
C. -96.0 kJ/mol
D. -100.0 kJ/mol
Question 6
The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO?
A. -110.5
B. -130.5
C. -150.5
D. -170.5
Question 7
The diagram below shows a titration setup. Identify the part labeled A.
A. A burette
B. A beaker
C. A pipette
D. A flask
Question 8
The rate cons\tant for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 9
The following diagram shows the structure of a compound. What is the name of this compound?
A. Ethanol
B. Propanol
C. Bu\tanol
D. Pen\tanol
Question 10
A sample of a subs\tance has a mass of 25 g. If the density of the subs\tance is 2.5 g/mL, what is the volume of the subs\tance?
A. 10 mL
B. 20 mL
C. 25 mL
D. 30 mL
Question 11
The reaction between sodium hydroxide and sulfuric acid is represented by the equation: 2NaOH + H2SO4 → Na2SO4 + 2H2O. What is the oxidation state of sulfur in the product Na2SO4?
A. +2
B. +4
C. +6
D. +8
Question 12
The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. What is the oxidation state of chlorine in the product NaClO?
A. 0
B. +1
C. +2
D. +3
Question 13
The following diagram shows a setup for the titration of a strong acid with a strong base. What is the purpose of the burette in this setup?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution
Question 14
The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100 g, what is the amount of the subs\tance remaining after 10 years?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 15
A 2.0 L flask contains 0.5 mol of H2 at 25°C. Calculate the number of moles of O2 required to react with H2 completely.
A. 0.25
B. 0.5
C. 0.75
D. 1.0

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