POST UTME BABCOCK UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 7
B. 8
C. 9
D. 10
Question 2
A metal oxide is reduced to its corresponding metal by heating in a stream of hydrogen gas. If the reaction is represented by the equation: \[\text{M}_2\text{O}_3 + 3\text{H}_2 \rightarrow 2\text{M} + 3\text{H}_2\text{O}\], what is the oxidation state of the metal (M)?
A. +3
B. +2
C. +1
D. +4
Question 3
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the concentration of the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.05 M
D. 0.01 M
Question 4
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. 7
B. 8
C. 9
D. 10
Question 5
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.0025
B. 0.0050
C. 0.0075
D. 0.0100
Question 6
Determine the number of unpaired electrons in the ground state of a neutral atom of the element with atomic number 17.
A. 1
B. 3
C. 5
D. 7
Question 7
The diagram below shows a titration setup. 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 mix the acid and base
D. To measure the pH of the solution
Question 8
A solution of sulfuric acid is titrated with a solution of sodium hydroxide. If the initial concentration of sulfuric acid is 0.1 M and the initial concentration of sodium hydroxide is 0.2 M, what is the pH of the solution after the reaction is complete?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 9
A sample of a metal is heated in a stream of oxygen gas. If the reaction is represented by the equation: \[\text{M} + \frac{1}{2}\text{O}_2 \rightarrow \text{MO}\], what is the oxidation state of the metal (M)?
A. +2
B. +3
C. +4
D. +5
Question 10
A 2.5 M solution of NaOH is mixed with 1.0 M HCl. What is the resulting concentration of the salt formed?
A. 1.0 M
B. 2.0 M
C. 2.5 M
D. 5.0 M
Question 11
The reaction of sodium with water is highly exothermic. What is the primary reason for this exothermic nature?
A. The reaction releases a large amount of heat energy due to the breaking of strong ionic bonds.
B. The reaction releases a large amount of heat energy due to the formation of strong covalent bonds.
C. The reaction releases a large amount of heat energy due to the release of electrons from the sodium atoms.
D. The reaction releases a large amount of heat energy due to the formation of hydrogen gas.
Question 12
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 13
A 2.0 g sample of a polymer is dissolved in 100 mL of solvent. What is the molarity of the solution?
A. 0.02 M
B. 0.02 g/mL
C. 0.2 M
D. 0.02 g/100 mL
Question 14
A sample of a metal oxide has a mass of 25.0 g and a volume of 2.5 cm^3. What is the density of the metal oxide?
A. 5.0 g/cm^3
B. 10.0 g/cm^3
C. 15.0 g/cm^3
D. 20.0 g/cm^3
Question 15
A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.0313 atm, what is the mole \fraction of nitrogen gas?
A. 0.999
B. 0.9995
C. 0.9999
D. 0.99995

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