POST UTME BSU 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A 0.500 M solution of HCl(aq) is titrated with a 0.500 M solution of NaOH(aq). What is the pH of the solution after 25.0 mL of NaOH(aq) has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 3
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance is initially present, how much of the subs\tance will remain after 20.0 days?
A. 12.5 mg
B. 25.0 mg
C. 50.0 mg
D. 100.0 mg
Question 4
A 500 mL sample of a 0.500 M solution of sodium chloride (NaCl) is diluted to a total volume of 1.00 L. What is the new concentration of the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 5
A 2.00 M solution of H2SO4 is electrolyzed u\sing a platinum electrode. Calculate the mass of O2 gas produced at the anode after 1.50 hours, given that the current is 3.00 A and the cell potential is 2.50 V.
A. 0.150 g
B. 0.300 g
C. 0.450 g
D. 0.600 g
Question 6
Determine the number of moles of ΔH2O produced when 2.50 g of H2SO4 reacts with an excess of NaOH according to the equation: H2SO4 + 2NaOH → ΔH2O + Na2SO4. The molar mass of H2SO4 is 98.08 g/mol.
A. 0.0250 mol
B. 0.0500 mol
C. 0.100 mol
D. 0.200 mol
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
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 9
A 100.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the reaction is complete.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
Determine the molar mass of a polymer sample with the following composition: 80% polyethylene (C2H4) and 20% polypropylene (C3H6).
A. 120 g/mol
B. 150 g/mol
C. 180 g/mol
D. 200 g/mol
Question 11
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 12
A 2.50 M solution of HCl is electrolyzed u\sing a platinum electrode. Calculate the mass of Cl2 gas produced at the anode after 2.00 hours, given that the current is 5.00 A and the cell potential is 2.00 V.
A. 0.250 g
B. 0.500 g
C. 1.00 g
D. 1.50 g
Question 13
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance initially exists, how much will remain after 20.0 days?
A. 50.0 mg
B. 25.0 mg
C. 12.5 mg
D. 6.25 mg
Question 14
The diagram below shows a simple black and white chemistry apparatus setup. What is the purpose of the apparatus?
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 15
A 2.00 M solution of NaOH(aq) is titrated with a 1.00 M solution of HCl(aq). What is the pH of the solution after 50.0 mL of HCl(aq) has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

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