POST UTME MADONNA UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The following diagram 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 filter the solution
Question 2
Determine the molar solubility of CaF2 in a 0.1 M solution of NaF.
A. 1.0 x 10^-3 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-5 M
D. 1.0 x 10^-6 M
Question 3
Calculate the pH of a 0.1 M solution of HCl after 10 mL of 0.1 M NaOH has been added to it.
A. 1
B. 2
C. 3
D. 4
Question 4
A sample of polyethylene has a density of 0.95 g/cm^3. If the molar mass of the polymer is 28,000 g/mol, what is the degree of polymerization (DP) of the polymer?
A. 100
B. 200
C. 500
D. 1000
Question 5
The solubility of a sparingly soluble salt, CaF2, is 1.2 × 10^\( -5 \) mol/L at 25°C. If 100 mL of a 0.1 M Ca(NO3)2 solution is mixed with 100 mL of a 0.1 M HF solution, what is the concentration of CaF2 that will precipitate out of the solution?
A. \( 1.2 \times 10^{-5} \) mol/L
B. \( 1.2 \times 10^{-6} \) mol/L
C. \( 1.2 \times 10^{-4} \) mol/L
D. \( 1.2 \times 10^{-3} \) mol/L
Question 6
A 2.5 g sample of a subs\tance is dissolved in 25 mL of water. The resulting solution has a density of 1.2 g/mL. Calculate the molarity of the solution.
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 7
The entropy change (ΔS) for a reaction is given by the equation ΔS = ΔH/T - ΔU. If the reaction is exothermic, what can be concluded about the sign of ΔH?
A. The sign of \u0394H is positive.
B. The sign of \u0394H is negative.
C. The sign of \u0394H is zero.
D. The sign of \u0394H is dep\endent on the temperature.
Question 8
A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 0.5 L at 50°C. Calculate the final pressure of the gas.
A. 2 atm
B. 4 atm
C. 6 atm
D. 8 atm
Question 9
The diagram below shows a setup for determining the concentration of a strong base.
A. pH 7
B. pH 10
C. pH 12
D. pH 14
Question 10
A polymer is a long chain of repeating units called monomers. What is the name of the process by which a polymer is formed from its monomers?
A. Polymerization
B. Depolymerization
C. Condensation
D. Hydrolysis
Question 11
Determine the oxidation state of the underlined atom in the compound [Cr(H2O)6]Cl3.
A. +3
B. +2
C. +6
D. +1
Question 12
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the initial volume of the acid in liters.
A. 0.05 L
B. 0.1 L
C. 0.2 L
D. 0.5 L
Question 13
The diagram below shows a titration setup. If 25 mL of 0.1 M NaOH has been added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 14
The s\tandard enthalpy of formation \( ΔH_f^\circ \) of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation \( ΔH_f^\circ \) of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 15
A sample of a metal has a mass of 25 g and a volume of 5 cm^3. If the density of the metal is 8 g/cm^3, what is the percentage of the metal that is iron?
A. 50%
B. 60%
C. 70%
D. 80%

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