POST UTME SUMMIT UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 2
A 0.500 M solution of NaOH is mixed with a 0.250 M solution of HCl. What is the concentration of the resulting solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 3
A 2.5 g sample of an unknown metal is heated in a crucible until it melts. The mass of the crucible and metal is 10.2 g. After heating, the mass of the crucible is 9.7 g. What is the molar mass of the metal?
A. 50 g/mol
B. 60 g/mol
C. 70 g/mol
D. 80 g/mol
Question 4
A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required?
A. 20 mL
B. 30 mL
C. 40 mL
D. 50 mL
Question 5
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
A polymer is composed of 80% polyethylene and 20% polypropylene. If 100 g of the polymer is dissolved in 200 g of xylene, what is the mass of the polymer in the solution?
A. 120 g
B. 140 g
C. 160 g
D. 180 g
Question 7
A mixture of 2.0 g of NaCl and 3.0 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 8
A 2.00 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.50 g, what is the percentage yield of the metal oxide?
A. 75%
B. 80%
C. 85%
D. 90%
Question 9
A gas is collected over water at a temperature of 25°C and a pressure of 1 atm. The volume of the gas is 2.5 L. What is the partial pressure of the gas?
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 10
The reaction between sodium hydroxide and acetic acid is represented by the equation: CH3COOH + NaOH → CH3COONa + H2O. What is the value of ΔH for this reaction, given that ΔHf(CH3COOH) = -484.5 kJ/mol, ΔHf(CH3COONa) = -436.3 kJ/mol, and ΔHf(H2O) = -285.8 kJ/mol?
A. -123.1 kJ/mol
B. -123.5 kJ/mol
C. -122.9 kJ/mol
D. -123.0 kJ/mol
Question 11
The rate of a chemical reaction is influenced by the following factors: concentration of reac\tants, surface area of reac\tants, temperature, and catalyst. Which of the following is NOT a correct statement regarding the effect of surface area on the rate of a chemical reaction?
A. Increa\sing the surface area of the reac\tants increases the rate of the reaction.
B. Decrea\sing the surface area of the reac\tants decreases the rate of the reaction.
C. Increa\sing the surface area of the reac\tants has no effect on the rate of the reaction.
D. Increa\sing the surface area of the reac\tants decreases the rate of the reaction.
Question 12
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 13
Determine the s\tandard electrode potential of the cell represented by the following reaction: MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. Given that the s\tandard electrode potential of MnO4-/Mn2+ is +1.23 V.
A. +1.23 V
B. +1.48 V
C. +1.73 V
D. +1.98 V
Question 14
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 15
A 10.0 mL sample of a 0.100 M HCl solution is mixed with a 10.0 mL sample of a 0.100 M NaOH solution. What is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.00

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