POST UTME BSU 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 3
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 4
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
Question 5
A 2.0 g sample of a salt is dissolved in 100 mL of water. If the resulting solution has a pH of 7.5, what is the concentration of the salt?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
A 2.5 M solution of H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.5
B. 2.5
C. 3.5
D. 4.5
Question 7
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 8
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 9
A 1.00 M solution of HCl(aq) is titrated with a 1.00 M solution of NaOH(aq). What is the pH of the solution after 50.0 mL of NaOH(aq) has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
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 11
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 12
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 13
A sample of nitrogen gas at 25°C and 1 atm is heated to 50°C. What is the new volume of the gas, assuming ideal behavior?
A. 2.00 L
B. 1.50 L
C. 1.00 L
D. 0.50 L
Question 14
A 1.00 L sample of a hydrocarbon mixture contains 0.500 g of n-pen\tane (C5H12) and 0.750 g of isopen\tane (C5H12). Calculate the mole \fraction of n-pen\tane in the mixture.
A. 0.400
B. 0.500
C. 0.600
D. 0.700
Question 15
A 2.50 L flask contains 0.150 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: