POST UTME BSU 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 M solution of HCl is mixed with 2.0 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 2
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 of the reac\tant after 10 minutes?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 3
A sample of CO2(g) is collected over water at 25°C and 1 atm. What is the partial pressure of CO2(g) in the gas mixture?
A. 0.95 atm
B. 0.99 atm
C. 1.00 atm
D. 1.05 atm
Question 4
Determine the pH of a 0.01 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 5
A 0.1 M solution of NaCl is mixed with 0.1 M solution of AgNO3. What is the concentration of the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
The reaction between sodium and chlorine gas is a classic example of a synthesis reaction. What is the product of this reaction?
A. NaCl
B. Na2Cl2
C. NaCl2
D. Na2Cl
Question 7
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of Ba(OH)2. What is the concentration of the excess reac\tant after the reaction is complete?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 8
The following diagram shows a simple black and white chemistry apparatus showing titration setup. What is the purpose of the pipette?
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 separate the titrant and analyte
Question 9
A 25.0 mL sample of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH at the equivalence point.
A. 7
B. 8
C. 9
D. 10
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
A 25 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 20 mL of HCl has been added.
A. 1
B. 2
C. 3
D. 4
Question 12
A solution contains 0.1 M NaOH and 0.1 M HCl. Calculate the pH of the solution after 10 mL of 0.1 M HCl has been added to 20 mL of 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 13
A gas occupies a volume of 2 L at a pressure of 1 atm and a temperature of 300 K. What is the volume of the gas at a pressure of 2 atm and a temperature of 400 K?
A. 1 L
B. 2 L
C. 4 L
D. 8 L
Question 14
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 15
A 10.0 g sample of a mixture of NaCl and KCl is dissolved in water and then treated with AgNO3. If 25.0 mL of 0.1 M AgNO3 is required to precipitate all the chloride ions, what is the mass of KCl in the sample?
A. 2.0 g
B. 4.0 g
C. 6.0 g
D. 8.0 g

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