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POST UTME NILE UNIVERSITY 2022 Chemistry | Objective

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Question 1 View Details

A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in 4 L of water. What is the molarity of the solution?

Correct A. 2.5 M

B. 1.25 M

C. 0.5 M

D. 5 M

Correct Answer: A

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Question 2 View Details

The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -110 kJ/mol. What is the equilibrium cons\tant (K) for this reaction?

Correct A. 1.0 x 10^10

B. 1.0 x 10^5

C. 1.0 x 10^2

D. 1.0 x 10^-5

Correct Answer: A

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Question 3 View Details

A sample of CO2 gas at 25°C and 1 atm is collected over water in a flask. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of CO2?

Correct A. 0.977 atm

B. 0.923 atm

C. 0.869 atm

D. 0.815 atm

Correct Answer: A

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Question 4 View Details

A 0.100 M solution of FeCl3 is prepared by dissolving 3.0 g of FeCl3 in 1 L of water. What is the concentration of Fe3+ ions in the solution?

Correct A. 0.033 M

B. 0.100 M

C. 0.167 M

D. 0.250 M

Correct Answer: A

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Question 5 View Details

A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To separate the titrant and analyte

Correct Answer: A

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Question 6 View Details

The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. Which of the following is the major product?

A. 1,2-dibromocyclohexane

Correct B. 1,4-dibromocyclohexane

C. cis-1,2-dibromocyclohexane

D. trans-1,2-dibromocyclohexane

Correct Answer: B

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Question 7 View Details

The element with atomic number 36 is

Correct A. Krypton

B. Strontium

C. Barium

D. Caesium

Correct Answer: A

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Question 8 View Details

The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the unit of solubility?

A. g/L

Correct B. mol/L

C. g/mol

D. L/mol

Correct Answer: B

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Question 9 View Details

The reaction of sulfur with oxygen produces sulfur dioxide. The balanced equation for this reaction is

Correct A. S + O2 → SO2

B. S + O2 → SO3

C. S + O2 → SO4

D. S + O2 → SO5

Correct Answer: A

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Question 10 View Details

The element with atomic number 10 is

A. Neon

Correct B. Argon

C. Krypton

D. Xenon

Correct Answer: B

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Question 11 View Details

Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess O2 according to the equation: C6H12O6 + 6O2 → 6CO2 + 6H2O. The molar mass of C6H12O6 is 180 g/mol.

A. 0.025 mol

Correct B. 0.05 mol

C. 0.1 mol

D. 0.15 mol

Correct Answer: B

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Question 12 View Details

A 2.5 M solution of HCl is mixed with a 2.5 M solution of NaOH in a 1:1 mole ratio. What is the resulting concentration of the solution after the reaction is complete?

A. 2.5 M

Correct B. 1.25 M

C. 0.5 M

D. 0 M

Correct Answer: B

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Question 13 View Details

A sample of 1.0 g of a subs\tance is found to have a mass of 1.5 g after being dried in an oven at 120°C. What is the percentage of water in the original sample?

A. 10%

Correct B. 20%

C. 30%

D. 40%

Correct Answer: B

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Question 14 View Details

A reaction is represented by the equation: 2A + B → 2C + D. If 2.0 g of A and 1.5 g of B are mixed and allowed to react, what is the limiting reac\tant?

A. A

Correct B. B

C. C

D. D

Correct Answer: B

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Question 15 View Details

A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of Ba(OH)2 in a 1:1 mole ratio. What is the resulting concentration of the solution after the reaction is complete?

A. 1.0 M

Correct B. 0.5 M

C. 0.25 M

D. 0 M

Correct Answer: B

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Question 16 View Details

A 0.5 M solution of a weak acid, HA, is titrated with 0.5 M NaOH. If the initial pH of the solution is 3.5, what is the pH after the addition of 20 mL of NaOH?

A. 4.5

B. 5.5

Correct C. 6.5

D. 7.5

Correct Answer: C

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Question 17 View Details

A mixture of 2.0 g of glu\cose (C6H12O6) and 3.0 g of fructose (C6H12O6) is dissolved in 100 mL of water. What is the molarity of 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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Question 18 View Details

A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. If the pressure of the gas is 1.0 atm, what is the volume of the flask?

Correct A. 2.0 L

B. 2.5 L

C. 3.0 L

D. 3.5 L

Correct Answer: A

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Question 19 View Details

A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?

A. 100 g/mol

Correct B. 200 g/mol

C. 300 g/mol

D. 400 g/mol

Correct Answer: B

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Question 20 View Details

A 1.0 L flask contains 0.5 mol of a gas at a temperature of 400 K. If the pressure of the gas is 2.0 atm, what is the volume of the flask?

A. 1.0 L

B. 1.5 L

Correct C. 2.0 L

D. 2.5 L

Correct Answer: C

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Question 21 View Details

A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. If the pressure of the gas is 1.0 atm, what is the volume of the flask?

Correct A. 2.0 L

B. 2.5 L

C. 3.0 L

D. 3.5 L

Correct Answer: A

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Question 22 View Details

A 1.0 L flask contains 0.5 mol of a gas at a temperature of 400 K. If the pressure of the gas is 2.0 atm, what is the volume of the flask?

A. 1.0 L

B. 1.5 L

Correct C. 2.0 L

D. 2.5 L

Correct Answer: C

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Question 23 View Details

A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. If the pressure of the gas is 1.0 atm, what is the volume of the flask?

Correct A. 2.0 L

B. 2.5 L

C. 3.0 L

D. 3.5 L

Correct Answer: A

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Question 24 View Details

A 1.0 L flask contains 0.5 mol of a gas at a temperature of 400 K. If the pressure of the gas is 2.0 atm, what is the volume of the flask?

A. 1.0 L

B. 1.5 L

Correct C. 2.0 L

D. 2.5 L

Correct Answer: C

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Question 25 View Details

Determine the pH of a 0.1 M solution of HCl.

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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