POST UTME UNIBEN 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction of an alkene with a strong acid is an example of a(n) _______________________ reaction.
A. substitution
B. elimination
C. addition
D. condensation
Question 2
Determine the number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaC}_2$ is completely decomposed according to the equation $\text{CaC}_2(s) \rightarrow \text{Ca} (s) + \text{C} (s) + \text{CO}_2(g)$, given that the molar mass of $\text{CaC}_2$ is 64.10 g/mol.
A. 0.0391 mol
B. 0.0394 mol
C. 0.0397 mol
D. 0.0400 mol
Question 3
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution
Question 4
The reaction of a weak acid with a strong base is an example of a(n) _______________________ reaction.
A. neutralization
B. oxidation
C. reduction
D. combustion
Question 5
A 2.50 M solution of HCl is titrated with 0.500 M NaOH. What is the concentration of the excess HCl after 25.0 mL of NaOH has been added?
A. 0.50 M
B. 1.00 M
C. 1.50 M
D. 2.00 M
Question 6
The reaction of a strong acid with a weak base is an example of a(n) _______________________ reaction.
A. neutralization
B. oxidation
C. reduction
D. combustion
Question 7
A 10.0 mL sample of a solution containing 0.50 M $\text{HCl}$ is titrated with 0.10 M $\text{NaOH}$. Calculate the number of moles of $\text{NaOH}$ required to reach the equivalence point.
A. 0.0050 mol
B. 0.0055 mol
C. 0.0060 mol
D. 0.0065 mol
Question 8
A 0.100 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
A 2.5 L flask contains 0.50 mol of an ideal gas at 298 K. Calculate the pressure of the gas in pascals.
A. 101325 Pa
B. 101350 Pa
C. 101375 Pa
D. 101400 Pa
Question 10
A 2.50-g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.75 g, calculate the percentage yield of the metal oxide.
A. 75%
B. 80%
C. 85%
D. 90%
Question 11
A sample of 2.5 g of a subs\tance is found to have a mass of 2.2 g after being heated in a furnace at 1000°C for 1 hour. What is the percentage loss in mass?
A. 12%
B. 15%
C. 18%
D. 20%
Question 12
The reaction of a polymer with a solvent is an example of a(n) _______________________ reaction.
A. addition
B. condensation
C. substitution
D. elimination
Question 13
The reaction of a weak acid with a weak base is an example of a(n) _______________________ reaction.
A. neutralization
B. oxidation
C. reduction
D. combustion
Question 14
A 0.100 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 15
A colloidal solution of starch in water is 0.50 M. What is the concentration of the dispersed phase?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M

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