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 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 2
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\mathrm{HCl}$ is added to 25.0 mL of 0.100 M $\mathrm{NaOH}$, what is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 3
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 pH of the solution at the equivalence point.
A. 7
B. 8
C. 9
D. 10
Question 4
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
Question 5
The polymer polyethylene (C2H4)n is a type of ______ polymer.
A. elastomer
B. thermoplastic
C. thermosetting
D. fibers
Question 6
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 7
A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. If the total pressure of the air is 1 atm, what is the partial pressure of CO2?
A. 0.05 atm
B. 0.1 atm
C. 0.15 atm
D. 0.2 atm
Question 8
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 9
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 10
A 1.0 L container is filled with a gas at 2.0 atm and 20°C. If the temperature is increased to 30°C, what is the new pressure?
A. 2.0 atm
B. 2.5 atm
C. 3.0 atm
D. 3.5 atm
Question 11
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 12
The diagram below shows a titration setup. What is the purpose of the burette in this setup?
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 13
A mixture of 2.0 g of NaCl and 1.0 g of KNO3 is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
The reaction of sodium metal with water to form sodium hydroxide and hydrogen gas is an example of a reaction. What type of reaction is this?
A. Neutralization reaction
B. Oxidation-reduction reaction
C. Synthesis reaction
D. Decomposition reaction
Question 15
A polymer is formed by the condensation reaction of two monomers, A and B, with the general equation: A + B → AB. If the molecular weight of A is 100 g/mol and the molecular weight of B is 150 g/mol, what is the average molecular weight of the polymer AB?
A. 120 g/mol
B. 125 g/mol
C. 130 g/mol
D. 140 g/mol

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