POST UTME SUMMIT UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a titration experiment, 25.0 mL of 0.100 M NaOH is required to neutralize 20.0 mL of a weak acid. Calculate the concentration of the acid.
A. 0.050 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 2
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 3
A sample of soil contains 0.500 g of CaCO3. Calculate the volume of 0.100 M HCl required to react with the CaCO3.
A. 10.0 mL
B. 20.0 mL
C. 30.0 mL
D. 40.0 mL
Question 4
A 0.500 M solution of HCl is mixed with a 0.250 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 5
A solution contains 0.5 M NaCl and 0.2 M CaCl2. What is the total concentration of chloride ions in the solution?
A. 0.7 M
B. 0.8 M
C. 0.9 M
D. 1.0 M
Question 6
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 7
A solution containing 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 1.0 L of water. What is the concentration of Na+ ions in the solution?
A. 0.1 M
B. 0.05 M
C. 0.02 M
D. 0.01 M
Question 8
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 9
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 10
A sample of an ideal gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased to 375 K, what is the new volume of the gas?
A. 3.5 L
B. 4.2 L
C. 5.0 L
D. 6.0 L
Question 11
A 2.0 L flask contains 0.5 M H2 and 0.5 M O2 at 25°C. What is the partial pressure of H2 in the flask?
A. 0.5 atm
B. 1.0 atm
C. 2.0 atm
D. 3.0 atm
Question 12
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 13
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 14
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 15
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

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