POST UTME CHRISTOPHER UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. The pH of the solution after the addition of 20 mL of HCl is 3.5. What is the pH of the solution after the addition of 40 mL of HCl?
A. 2.0
B. 2.5
C. 3.0
D. 3.5
Question 2
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 after 10 minutes?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 3
A solution of 0.1 M NaOH is prepared by dissolving 4.0 g of NaOH in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.4 g/L
B. 4.0 g/L
C. 40 g/L
D. 400 g/L
Question 4
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -1.3 \).
A. 1
B. 2
C. 3
D. 4
Question 5
A sample of a hydrocarbon has a molecular formula of C6H14. What is the name of the hydrocarbon?
A. hexane
B. hep\tane
C. oc\tane
D. nonane
Question 6
A 2.00 g sample of a subs\tance is dissolved in 100.0 mL of water. If the resulting solution has a concentration of 0.100 M, what is the molar mass of the subs\tance?
A. 20.0 g/mol
B. 40.0 g/mol
C. 60.0 g/mol
D. 80.0 g/mol
Question 7
The diagram below shows the reaction between nitrogen and oxygen to form nitrogen dioxide.
A. 2NO + O2 → 2NO2
B. 2NO2 + O2 → 2NO
C. 2NO + 2O2 → 2NO2
D. 2NO2 + 2O2 → 2NO
Question 8
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7.0
B. 8.0
C. 9.0
D. 10.0
Question 9
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 10
The polymerization of ethylene to produce polyethylene is an example of what type of polymerization reaction?
A. Condensation polymerization
B. Addition polymerization
C. Ring-opening polymerization
D. Step-growth polymerization
Question 11
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: NaOH + HCl → NaCl + H2O. What is the type of reaction?
A. Synthesis reaction
B. Decomposition reaction
C. Neutralization reaction
D. Combustion reaction
Question 12
A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of polymers?
A. They are typically found in nature
B. They have a high melting point
C. They are composed of many repeated subunits called monomers
D. They are typically soluble in water
Question 13
A solution of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 14
A solution of 0.1 M NaCl is mixed with a solution of 0.1 M CaCl2. What is the concentration of Cl- ions in the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 15
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

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