POST UTME DELSU 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50-g sample of a non-metallic element is found to have a mass of 2.00 g after being heated in a stream of oxygen gas. Calculate the empirical formula of the element.
A. P2O5
B. SO3
C. Cl2O7
D. Br2O7
Question 2
The diagram below shows a titration curve for the titration of a weak acid with a strong base. What is the pH of the solution at point A?
A. 4
B. 5
C. 6
D. 7
Question 3
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 4
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 1
B. 2
C. 3
D. 4
Question 5
The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O?
A. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -483.5 kJ/mol
Question 6
A polymer is a large molecule composed of many smaller molecules called monomers. What is the type of polymer that is formed when ethylene is polymerized?
A. Thermoplastic
B. Thermosetting
C. Elastomer
D. Fibers
Question 7
Calculate the molar mass of a compound composed of 60.0% carbon, 8.0% hydrogen, and 32.0% oxygen by mass.
A. 120.0 g/mol
B. 150.0 g/mol
C. 180.0 g/mol
D. 200.0 g/mol
Question 8
A solution contains 0.500 M NaCl. Calculate the concentration of Cl^- ions in the solution.
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 9
Identify the type of isomerism exhibited by the compound 1,2-dimethylcyclohexane.
A. Structural isomerism
B. Stereoisomerism
C. Conformational isomerism
D. Tautomeric isomerism
Question 10
A 100-mL solution of 0.5 M NaCl is mixed with a 200-mL solution of 0.2 M NaCl. What is the resulting concentration of NaCl?
A. 0.3 M
B. 0.4 M
C. 0.5 M
D. 0.6 M
Question 11
A 2.5 M solution of NaOH is titrated with a 1.0 M solution of HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4
Question 12
A solution of NaOH is 0.1 M. If 25 mL of this solution is titrated with 0.1 M HCl, what is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 13
Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in ethanol.
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Condensation reaction
Question 14
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 15
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
D. 4

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