POST UTME WELLSPRING UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. - 180.5 kJ/mol
B. - 393.5 kJ/mol
C. - 180.5 kJ/mol + 393.5 kJ/mol
D. - 393.5 kJ/mol - 180.5 kJ/mol
Question 2
A sample of 0.500 g of a polymer is dissolved in 100.0 mL of a solvent. If the density of the solution is 1.05 g/mL, what is the molar mass of the polymer?
A. 500 g/mol
B. 1000 g/mol
C. 2000 g/mol
D. 5000 g/mol
Question 3
A sample of a metal has a mass of 50.0 g and a volume of 5.0 cm³. What is the density of the metal?
A. 10.0 g/cm³
B. 5.0 g/cm³
C. 2.5 g/cm³
D. 1.0 g/cm³
Question 4
A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 5
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Test tube
D. Cylinder
Question 6
The half-life of a radioactive subs\tance is 5.0 days. If a sample initially contains 1000 mg of the subs\tance, what is the mass remaining after 20 days?
A. 100 mg
B. 200 mg
C. 500 mg
D. 1000 mg
Question 7
A solution contains 0.100 M NaCl. What is the concentration of Cl⁻ ions in the solution?
A. 0.050 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. - 180.5 kJ/mol
B. - 393.5 kJ/mol
C. - 180.5 kJ/mol + 393.5 kJ/mol
D. - 393.5 kJ/mol - 180.5 kJ/mol
Question 9
A 1.0 M solution of acetic acid (CH3COOH) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 10
A 0.100 M solution of HCl is mixed with a 0.100 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 11
A 10.0 mL sample of a solution containing 0.500 M NaCl is titrated with 0.500 M AgNO3. Calculate the volume of AgNO3 required to reach the equivalence point.
A. 20.0 mL
B. 20.0 mL
C. 20.0 mL
D. 20.0 mL
Question 12
A sample of a non-metallic element has a mass of 25.0 g and a volume of 10.0 cm³. What is the density of the element?
A. 2.5 g/cm³
B. 2.0 g/cm³
C. 1.5 g/cm³
D. 1.0 g/cm³
Question 13
In the electrolysis of a molten ionic compound, what is the primary function of the inert electrode?
A. To facilitate the flow of ions towards the electrode
B. To prevent the reaction from occurring
C. To provide a path for the electrons to flow
D. To increase the temperature of the electrolyte
Question 14
A 2.5 M solution of sodium hydroxide (NaOH) is titrated with a 0.5 M solution of hydrochloric acid (HCl). What is the pH of the resulting solution after 25 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4
Question 15
A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0

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