POST UTME NILE UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the s\tandard enthalpy of formation of CO2(g)?
A. -393.5 kJ/mol
B. -393.5 kJ/mol
C. -393.5 kJ/mol
D. -393.5 kJ/mol
Question 2
A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in 4 L of water. What is the molarity of the solution?
A. 2.5 M
B. 1.25 M
C. 0.5 M
D. 5 M
Question 3
The reaction of sulfur with oxygen produces sulfur dioxide. The balanced equation for this reaction is
A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5
Question 4
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To measure the pH of the solution
D. To measure the temperature of the solution
Question 5
The reaction of hydrogen gas with oxygen gas is represented by the equation: 2H2(g) + O2(g) → 2H2O(l). What is the oxidation state of oxygen in the product H2O(l)?
A. -1
B. +1
C. +2
D. 0
Question 6
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
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 separate the titrant and analyte
Question 7
A sample of CO2 gas at 25°C and 1 atm is collected over water in a flask. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of CO2?
A. 0.977 atm
B. 0.923 atm
C. 0.869 atm
D. 0.815 atm
Question 8
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the unit of solubility?
A. g/L
B. mol/L
C. g/mol
D. L/mol
Question 9
A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1 M
Question 10
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 11
A reaction is represented by the equation: 2A + B → 2C + D. If 2.0 g of A and 1.5 g of B are mixed and allowed to react, what is the limiting reac\tant?
A. A
B. B
C. C
D. D
Question 12
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is initially present, how much will remain after 10 years?
A. 50 g
B. 25 g
C. 12.5 g
D. 6.25 g
Question 13
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. Which of the following is the major product?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,2-dibromocyclohexane
Question 14
Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess O2 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. 0.1 mol
D. 0.15 mol
Question 15
A 1.0 L flask contains 0.5 mol of a gas at a temperature of 400 K. If the pressure of the gas is 2.0 atm, what is the volume of the flask?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L

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