POST UTME COAL CITY UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of Ba(OH)2. Calculate the pH of the resulting solution after the reaction is complete.
A. 2
B. 2
C. 2
D. 2
Question 2
A 0.1 M solution of sodium hydroxide (NaOH) is mixed with a 0.2 M solution of hydrochloric acid (HCl). If the reaction is allowed to proceed to completion, calculate the concentration of the resulting solution.
A. 0.05 M
B. 0.15 M
C. 0.25 M
D. 0.35 M
Question 3
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 4
A 1.00 g sample of a metal carbonate is heated to produce a 0.75 g sample of the metal oxide. What is the molar mass of the metal carbonate?
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 5
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.
A. 100
B. 200
C. 300
D. 400
Question 7
A polymer is composed of repeating units of the following structure: CH2-CH2-CH2-CH2. What is the name of this polymer?
A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polystyrene
Question 8
A solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in 100 mL of water. What is the molarity of the solution?
A. 0.625 M
B. 0.75 M
C. 1.25 M
D. 1.5 M
Question 9
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 10
A 1.0 L solution of 0.1 M NaOH is mixed with 1.0 L of 0.1 M HCl. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 11
A 0.5 M solution of potassium chloride (KCl) is electrolyzed u\sing a platinum electrode. If the cell potential is 2.5 V, calculate the number of moles of chlorine gas evolved at the anode.
A. 0.08 mol
B. 0.16 mol
C. 0.24 mol
D. 0.32 mol
Question 12
A 250 mL sample of a 0.50 M solution of NaOH is mixed with a 250 mL sample of a 0.50 M solution of HCl. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 13
A 25.0 mL sample of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after the addition of 15.0 mL of HCl.
A. 1
B. 2
C. 3
D. 4
Question 14
A sample of a metal oxide is heated in a crucible. The mass of the oxide is 25.0 g, and the mass of the metal obtained is 15.0 g. What is the percentage yield of the metal?
A. 40%
B. 50%
C. 60%
D. 70%
Question 15
A 250 mL sample of a 0.50 M solution of NaOH is mixed with a 250 mL sample of a 0.50 M solution of HCl. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

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