POST UTME AFE BABALOLA UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. If 25 mL of HCl is required to reach the equivalence point, calculate the number of moles of HCl.
A. 0.005 mol
B. 0.01 mol
C. 0.015 mol
D. 0.02 mol
Question 2
The reaction between sodium hydroxide and acetic acid is a classic example of a reaction that can be classified as a type of reaction. What type of reaction is this?
A. Neutralization reaction
B. Oxidation-reduction reaction
C. Acid-base reaction
D. Combustion reaction
Question 3
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 4
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 25 mL of HCl is required to reach the equivalence point, calculate the volume of NaOH required to reach the equivalence point when 50 mL of 0.1 M HCl is added.
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 5
The half-life of a radioactive subs\tance is 10 years. If the initial activity is 1000 Bq, what is the activity after 20 years?
A. 100 Bq
B. 100 Bq
C. 500 Bq
D. 500 Bq
Question 6
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. If 20 mL of H2SO4 is added to 20 mL of NaOH, what is the resulting pH?
A. 0
B. 1
C. 2
D. 3
Question 7
The diagram below shows a cross-section of a plant cell. Identify the part labeled A.
A. Mitochondria
B. Chloroplast
C. Vacuole
D. Nucleus
Question 8
A 2.0 L container is filled with a gas at 4.0 atm and 25°C. If the volume is decreased to 1.0 L, what is the new pressure?
A. 4.0 atm
B. 6.0 atm
C. 8.0 atm
D. 10 atm
Question 9
The polymer polyethylene (C2H4)n is a type of ______ polymer.
A. elastomer
B. thermoplastic
C. thermosetting
D. fibers
Question 10
The reaction between sodium (Na) and chlorine (Cl2) to form sodium chloride (NaCl) is an example of a ______ reaction.
A. synthesis
B. decomposition
C. replacement
D. combustion
Question 11
A sample of a gas at 25°C and 1 atm is compressed to half its original volume. What is the new pressure, in atm, if the gas behaves ideally?
A. 2 atm
B. 1 atm
C. 0.5 atm
D. 4 atm
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -210.5 kJ/mol
D. -410.5 kJ/mol
Question 13
The rate cons\tant (k) for a first-order reaction is given by the equation: ln\( [A]t/[A]0 \) = -kt. If the half-life of the reaction is 10 minutes, what is the value of k?
A. 0.0693 min^-1
B. 0.0693 min^-1
C. 0.693 min^-1
D. 6.93 min^-1
Question 14
The reaction of hydrogen gas with chlorine gas to form hydrogen chloride gas is an example of a reaction. What type of reaction is this?
A. Combustion reaction
B. Oxidation-reduction reaction
C. Synthesis reaction
D. Decomposition reaction
Question 15
Determine the number of moles of $\mathrm{CaCO_3}$ that can be obtained from 0.250 mol of $\mathrm{Ca(OH)_2}$ in a reaction where $\mathrm{CaCO_3}$ is produced.
A. 0.250 mol
B. 0.500 mol
C. 0.750 mol
D. 1.000 mol

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