POST UTME OSUSTECH 2019 Chemistry | Objective

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Question 1 View Details
Determine the number of unpaired electrons in the ground state of the chromium atom \( Z = 24 \).
A. 0
Correct B. 2
C. 4
D. 6

Correct Answer: B

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Question 2 View Details
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 15.0 mL of NaOH.
A. 2.00
B. 2.50
Correct C. 3.00
D. 3.50

Correct Answer: C

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Question 3 View Details
The diagram below shows a simple electrolysis setup. What is the purpose of the salt bridge?
A. To prevent the mixing of the two electrolytes.
Correct B. To allow the flow of ions between the two electrolytes.
C. To prevent the buildup of gas bubbles at the electrodes.
D. To increase the conductivity of the electrolyte.

Correct Answer: B

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Question 4 View Details
A polymer is composed of repeating units of the following structure: CH2-CH2-CH2-CH2. What is the name of this polymer?
Correct A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polystyrene

Correct Answer: A

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Question 5 View Details
The diagram below shows a titration setup. What is the purpose of the burette?
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 prevent the mixing of the titrant and analyte.

Correct Answer: A

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Question 6 View Details
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the equivalence point is reached at 35.0 mL of NaOH, what is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 7 View Details
A solution contains 0.500 g of KCl per 100 mL. What is the molarity of the solution?
A. 0.500 M
Correct B. 1.00 M
C. 2.00 M
D. 5.00 M

Correct Answer: B

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Question 8 View Details
A 2.50 L container holds 0.500 mol of CO2 at 25°C. What is the partial pressure of CO2 in the container?
A. 0.500 atm
Correct B. 1.00 atm
C. 2.00 atm
D. 5.00 atm

Correct Answer: B

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Question 9 View Details
A 0.500 L container holds 0.500 mol of H2 at 25°C. What is the partial pressure of H2 in the container?
A. 0.500 atm
Correct B. 1.00 atm
C. 2.00 atm
D. 5.00 atm

Correct Answer: B

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Question 10 View Details
A 2.50 L container holds 0.500 mol of O2 at 25°C. What is the partial pressure of O2 in the container?
A. 0.500 atm
Correct B. 1.00 atm
C. 2.00 atm
D. 5.00 atm

Correct Answer: B

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Question 11 View Details
The reaction between sulfuric acid and sodium hydroxide is a classic example of a double displacement reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
Correct A. \text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}
B. \text{H}_2\text{SO}_4 + \text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}
C. \text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}
D. \text{H}_2\text{SO}_4 + \text{NaOH} \rightarrow \text{H}_2\text{O} + \text{Na}_2\text{SO}_4

Correct Answer: A

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Question 12 View Details
A 25 mL sample of 0.1 M hydrochloric acid is titrated with 0.1 M sodium hydroxide. Calculate the volume of sodium hydroxide required to reach the equivalence point.
Correct A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL

Correct Answer: A

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Question 13 View Details
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. Sodium hydroxide
Correct B. Hydrochloric acid
C. Sulfuric acid
D. Nitric acid

Correct Answer: B

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Question 14 View Details
The reaction between ethanol and sulfuric acid is a classic example of an acid-catalyzed dehydration reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
Correct A. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{HSO}_4^-
B. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{H}_2\text{SO}_4
C. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{H}_2\text{O}
D. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{SO}_4^2-

Correct Answer: A

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Question 15 View Details
A 50 mL sample of 0.2 M sodium hydroxide is titrated with 0.2 M hydrochloric acid. Calculate the volume of hydrochloric acid required to reach the equivalence point.
A. 12.5 mL
Correct B. 25 mL
C. 37.5 mL
D. 50 mL

Correct Answer: B

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Question 16 View Details
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. Sodium hydroxide
Correct B. Hydrochloric acid
C. Sulfuric acid
D. Nitric acid

Correct Answer: B

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Question 17 View Details
The solubility of a subs\tance in water is measured by its molar solubility (S) in moles per liter. If the solubility of a subs\tance is 0.5 M at 25°C, what is the concentration of the subs\tance in a 2.0 L solution?
Correct A. 1.0 M
B. 0.5 M
C. 0.25 M
D. 0.125 M

Correct Answer: A

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Question 18 View Details
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the molar mass of the subs\tance?
A. 80 g/mol
Correct B. 120 g/mol
C. 160 g/mol
D. 200 g/mol

Correct Answer: B

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Question 19 View Details
A 1.0 L solution of a subs\tance is prepared by dissolving 20 g of the subs\tance in 1.0 L of water. What is the molar solubility of the subs\tance?
Correct A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 4.0 M

Correct Answer: A

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Question 20 View Details
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 2.0 L solution?
A. 1.0 M
Correct B. 2.0 M
C. 4.0 M
D. 8.0 M

Correct Answer: B

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Question 21 View Details
A 1.0 L solution of a subs\tance is prepared by dissolving 20 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 1.0 L solution?
A. 0.5 M
Correct B. 1.0 M
C. 2.0 M
D. 4.0 M

Correct Answer: B

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Question 22 View Details
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the molar mass of the subs\tance?
A. 80 g/mol
Correct B. 120 g/mol
C. 160 g/mol
D. 200 g/mol

Correct Answer: B

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Question 23 View Details
A 1.0 L solution of a subs\tance is prepared by dissolving 20 g of the subs\tance in 1.0 L of water. What is the molar solubility of the subs\tance?
Correct A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 4.0 M

Correct Answer: A

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Question 24 View Details
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 2.0 L solution?
A. 1.0 M
Correct B. 2.0 M
C. 4.0 M
D. 8.0 M

Correct Answer: B

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Question 25 View Details
A 1.0 L solution of a subs\tance is prepared by dissolving 20 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 1.0 L solution?
A. 0.5 M
Correct B. 1.0 M
C. 2.0 M
D. 4.0 M

Correct Answer: B

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