POST UTME COVENANT UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between aluminum metal and iron(III) chloride solution is represented by the equation: 2Al(s) + 3FeCl3(aq) → 2AlCl3(aq) + 3Fe(s). If 25.0 g of aluminum metal is added to 250 mL of 0.100 M FeCl3 solution, what is the limiting reac\tant?
A. Al
B. FeCl3
C. AlCl3
D. Fe
Question 2
A metal oxide, M2O3, is formed by the reaction of a metal, M, with oxygen. If 2.5 g of M2O3 is obtained from 3.2 g of M, calculate the percentage yield of the reaction.
A. 60%
B. 70%
C. 80%
D. 90%
Question 3
A 250 mL sample of a 0.5 M solution of potassium nitrate (KNO3) is diluted to a total volume of 1 L. Determine the concentration of the resulting solution.
A. 0.1 M
B. 0.25 M
C. 0.5 M
D. 1.0 M
Question 4
A 0.500 M solution of $\text{H}_2SO_4$ is titrated with 0.500 M $\text{NaOH}$. If 25.0 mL of $\text{NaOH}$ is required to reach the equivalence point, calculate the number of moles of $\text{H}_2SO_4$ present in 50.0 mL of the solution.
A. 0.0100 mol
B. 0.0150 mol
C. 0.0200 mol
D. 0.0250 mol
Question 5
The diagram below shows the atomic structure of a metal atom.
A. The metal atom has 2 valence electrons.
B. The metal atom has 3 valence electrons.
C. The metal atom has 4 valence electrons.
D. The metal atom has 5 valence electrons.
Question 6
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. Calculate the change in internal energy (ΔU) of the gas.
A. 0 J
B. 1000 J
C. 2000 J
D. 3000 J
Question 7
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the concentration of HCl is 0.1 M.
A. 1
B. 2
C. 3
D. 4
Question 8
The reaction between zinc metal and copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 25.0 g of zinc metal is added to 250 mL of 0.100 M CuSO4 solution, what is the limiting reac\tant?
A. Zn
B. CuSO4
C. ZnSO4
D. Cu
Question 9
A metal, M, reacts with oxygen to form a metal oxide, MO. If 2.5 g of M is obtained from 3.2 g of MO, calculate the percentage yield of the reaction.
A. 60%
B. 70%
C. 80%
D. 90%
Question 10
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 50.0 mL of NaOH.
A. 3.00
B. 3.50
C. 4.00
D. 4.50
Question 11
The reaction between sulfuric acid and sodium hydroxide is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 25.0 g of H2SO4 is added to 100.0 mL of 0.100 M NaOH, what is the limiting reac\tant?
A. H2SO4
B. NaOH
C. Na2SO4
D. H2O
Question 12
The diagram below shows a titration setup.
A. The burette contains the acid.
B. The burette contains the base.
C. The beaker contains the acid.
D. The beaker contains the base.
Question 13
A 2.0 M solution of sodium hydroxide (NaOH) is mixed with a 1.0 M solution of hydrochloric acid (HCl). If 50 mL of the NaOH solution is added to 100 mL of the HCl solution, what is the pH of the resulting solution?
A. 2
B. 3
C. 4
D. 5
Question 14
A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, calculate the partial pressure of the nitrogen gas.
A. 0.95 atm
B. 1.05 atm
C. 1.10 atm
D. 1.15 atm
Question 15
A chemical reaction involves the transfer of electrons from one species to another. Which of the following is an example of a chemical reaction?
A. Photosynthesis
B. Respiration
C. Decomposition
D. Combustion

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