POST UTME DELSU 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Calculate the concentration of a solution containing 25.0 g of NaCl in 250.0 mL of water.
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 2
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 3
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 4
A 2.5-g sample of a polymer is dissolved in 100 mL of solvent. The resulting solution has a concentration of 0.25 g/mL. What is the molar mass of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 5
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 6
A colloid is a mixture in which the particles are 1-100 nm in diameter. What is the type of colloid that is formed when 1 g of gum arabic is added to 100 mL of water?
A. True solution
B. Colloid
C. Suspension
D. Emulsion
Question 7
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 8
What is the pH of a 0.1 M solution of HCl?
A. 0
B. 1
C. 2
D. 3
Question 9
Determine the number of unpaired electrons in the ground state of a neutral atom of the element with atomic number 15.
A. 3
B. 5
C. 7
D. 9
Question 10
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the number of moles of H2SO4.
A. 0.025
B. 0.05
C. 0.075
D. 0.1
Question 11
A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the number of moles of NaOH.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 12
Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4), 20% polypropylene (C3H6), and 20% polystyrene (C8H8).
A. 60 g/mol
B. 120 g/mol
C. 180 g/mol
D. 240 g/mol
Question 13
The molar solubility of Ag2CrO4 is 1.2 x 10^-3 M. Calculate the solubility product cons\tant (Ksp) for Ag2CrO4.
A. 1.4 x 10^-9
B. 1.8 x 10^-9
C. 2.2 x 10^-9
D. 2.6 x 10^-9
Question 14
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 15
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

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