POST UTME SUMMIT UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME SUMMIT UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
The s\tandard Gibbs free energy change (ΔG°) for a reaction is -120 kJ/mol. If the reaction is carried out at 298 K, what is the value of the equilibrium cons\tant (K) at this temperature?
A. 1.0 x 10^12
B. 1.0 x 10^6
C. 1.0 x 10^3
Correct D. 1.0 x 10^0

Correct Answer: D

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Question 2
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
Correct C. 5.0 L
D. 6.0 L

Correct Answer: C

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Question 3
The half-life of a radioactive subs\tance is 5.0 years. If a sample initially contains 100 g of the subs\tance, what is the mass of the subs\tance remaining after 20 years?
Correct A. 12.5 g
B. 25.0 g
C. 50.0 g
D. 100 g

Correct Answer: A

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Question 4
A solution contains 0.50 M NaCl. If 25 mL of the solution is diluted to a total volume of 100 mL, what is the new concentration of the solution?
A. 0.25 M
Correct B. 0.50 M
C. 0.75 M
D. 1.0 M

Correct Answer: B

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Question 5
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of each solution is used, what is the concentration of the resulting solution?
A. 0.50 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 6
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HA?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: B

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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
Correct C. 0.3 M
D. 0.4 M

Correct Answer: C

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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
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 9
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?
Correct A. 20 mL
B. 30 mL
C. 40 mL
D. 50 mL

Correct Answer: A

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Question 10
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If 10 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HA?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: B

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Question 11
A 2.50 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 1.75 g, calculate the percentage yield of the metal oxide.
A. 85%
B. 90%
Correct C. 95%
D. 80%

Correct Answer: C

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Question 12
A solution containing 0.050 M NaCl is mixed with a solution containing 0.050 M AgNO3. If the reaction is allowed to proceed to completion, what is the concentration of the common ion in the resulting solution?
Correct A. 0.025 M
B. 0.050 M
C. 0.075 M
D. 0.100 M

Correct Answer: A

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Question 13
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
Correct B. 8.00
C. 9.00
D. 10.00

Correct Answer: B

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Question 14
A 5.00 g sample of a metal hydroxide is dissolved in water to produce a solution with a pH of 10.5. What is the concentration of the metal ion in the resulting solution?
A. 0.050 M
B. 0.075 M
Correct C. 0.100 M
D. 0.125 M

Correct Answer: C

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Question 15
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%
Correct C. 85%
D. 90%

Correct Answer: C

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Question 16
The solubility of a gas in a liquid is influenced by the following factors: temperature, pressure, and the nature of the gas and liquid. Which of the following is NOT a correct statement regarding the effect of temperature on the solubility of a gas in a liquid?
A. Increa\sing the temperature of the liquid increases the solubility of the gas.
B. Decrea\sing the temperature of the liquid decreases the solubility of the gas.
Correct C. Increa\sing the temperature of the liquid has no effect on the solubility of the gas.
D. Increa\sing the temperature of the liquid decreases the solubility of the gas.

Correct Answer: C

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Question 17
A solution contains 0.5 M NaCl and 0.2 M CaCl2. What is the total concentration of chloride ions in the solution?
Correct A. 0.7 M
B. 0.8 M
C. 0.9 M
D. 1.0 M

Correct Answer: A

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Question 18
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.
Correct 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.

Correct Answer: C

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Question 19
A 2.0 M solution of HCl is titrated with a 1.0 M solution of NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 20
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
Correct B. 1.0 atm
C. 1.5 atm
D. 2.0 atm

Correct Answer: B

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Question 21
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
Correct B. +1.48 V
C. +1.73 V
D. +1.98 V

Correct Answer: B

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Question 22
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
Correct C. 160 g
D. 180 g

Correct Answer: C

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Question 23
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
Correct B. 1 L
C. 2 L
D. 4 L

Correct Answer: B

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Question 24
What is the major product of the reaction between 2-methylpropane and HCl?
Correct A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
C. 2-chloro-2-methylpropane
D. 2-chloro-2-methylpropane

Correct Answer: A

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Question 25
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
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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