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POST UTME COAL CITY UNIVERSITY 2018 Chemistry | Objective

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Question 1 View Details

A 0.5 M solution of sulfuric acid (H2SO4) is prepared by dissolving 9.5 g of the acid in water to make 100 mL of solution. What is the concentration of the solution in mol/L?

A. 0.1 M

Correct B. 0.5 M

C. 1.0 M

D. 2.0 M

Correct Answer: B

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Question 2 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 measure the pH of the solution

Correct Answer: A

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Question 3 View Details

A sample of air contains 20% oxygen by volume. What is the partial pressure of oxygen in the air if the total pressure is 101.3 kPa?

Correct A. 20.26 kPa

B. 20.63 kPa

C. 20.98 kPa

D. 21.32 kPa

Correct Answer: A

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Question 4 View Details

The diagram below shows a simple black and white chemistry apparatus showing 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 measure the pH of the solution

Correct Answer: A

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Question 5 View Details

A 2.0 L sample of a gas at 27°C and 1.0 atm is compressed to 0.5 L at 37°C. What is the final pressure of the gas?

A. 2.5 atm

Correct B. 3.0 atm

C. 3.5 atm

D. 4.0 atm

Correct Answer: B

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Question 6 View Details

The pH of a solution is 4.5. Calculate the concentration of hydrogen ions in moles per liter.

A. 1.0 \times 10^{-5} M

Correct B. 1.0 \times 10^{-4} M

C. 1.0 \times 10^{-3} M

D. 1.0 \times 10^{-2} M

Correct Answer: B

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Question 7 View Details

A 2.5 g sample of sulfur is burned in oxygen to produce sulfur dioxide gas. Calculate the volume of sulfur dioxide gas produced at STP.

A. 1.0 L

B. 2.0 L

Correct C. 3.0 L

D. 4.0 L

Correct Answer: C

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Question 8 View Details

The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: \[ \text{NaOH} + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O} \]. Calculate the number of moles of sodium hydroxide required to react with 2.5 moles of hydrochloric acid.

Correct A. 2.5 mol

B. 1.0 mol

C. 0.5 mol

D. 1.5 mol

Correct Answer: A

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Question 9 View Details

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. A is the burette

B. A is the beaker

C. A is the pipette

D. A is the flask

Correct Answer: A

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Question 10 View Details

The pH of a solution is 7.5. Calculate the concentration of hydrogen ions in moles per liter.

A. 1.0 \times 10^{-7} M

B. 1.0 \times 10^{-6} M

Correct C. 1.0 \times 10^{-5} M

D. 1.0 \times 10^{-4} M

Correct Answer: C

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Question 11 View Details

Determine the number of moles of nitrogen gas (N2) produced when 2.5 moles of ammonia (NH3) react with an excess of oxygen gas (O2) according to the equation: 4NH3 + 5O2 → 4N2 + 6H2O.

A. 1.25 moles

B. 2.5 moles

Correct C. 3.75 moles

D. 5 moles

Correct Answer: C

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Question 12 View Details

A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 15 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 13 View Details

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?

Correct A. 100 g/mol

B. 200 g/mol

C. 50 g/mol

D. 25 g/mol

Correct Answer: A

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Question 14 View Details

A solution containing 0.05 M H2SO4 is titrated with 0.05 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 15 View Details

A 10 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 5 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 16 View Details

A polymer has a molecular weight of 30,000 g/mol and a degree of polymerization of 300. What is the molar mass of the repeating unit?

Correct A. 100 g/mol

B. 200 g/mol

C. 50 g/mol

D. 25 g/mol

Correct Answer: A

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Question 17 View Details

A 20 mL sample of a solution containing 0.05 M H2SO4 is titrated with 0.05 M NaOH. What is the pH of the solution after the addition of 15 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 18 View Details

A solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 10 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 19 View Details

A 15 mL sample of a solution containing 0.05 M H2SO4 is titrated with 0.05 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 20 View Details

A polymer has a molecular weight of 40,000 g/mol and a degree of polymerization of 400. What is the molar mass of the repeating unit?

Correct A. 100 g/mol

B. 200 g/mol

C. 50 g/mol

D. 25 g/mol

Correct Answer: A

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Question 21 View Details

Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of water at 25°C and 1 atm, given that the cell potential is 1.23 V.

A. 0.5 mol

Correct B. 1.0 mol

C. 1.5 mol

D. 2.0 mol

Correct Answer: B

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Question 22 View Details

A sample of nitrogen gas occupies 2.5 L at 25°C and 1 atm. Calculate the number of moles of nitrogen gas present, given that the molar volume of an ideal gas at STP is 22.4 L/mol.

A. 0.1 mol

Correct B. 0.2 mol

C. 0.3 mol

D. 0.4 mol

Correct Answer: B

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Question 23 View Details

The half-reaction for the reduction of oxygen gas is given by: 4H+ + O2 + 4e- → 2H2O. Calculate the s\tandard cell potential for the reaction.

A. -0.5 V

B. -1.0 V

Correct C. -1.5 V

D. -2.0 V

Correct Answer: C

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Question 24 View Details

A solution of sodium chloride is electrolyzed u\sing a platinum electrode. Calculate the mass of chlorine gas produced at the anode, given that the current is 2 A and the time is 5 minutes.

A. 0.1 g

B. 0.2 g

Correct C. 0.3 g

D. 0.4 g

Correct Answer: C

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Question 25 View Details

A sample of sulfur dioxide gas is collected over water at 25°C and 1 atm. Calculate the partial pressure of sulfur dioxide gas, given that the total pressure is 1.5 atm.

A. 0.5 atm

Correct B. 0.6 atm

C. 0.7 atm

D. 0.8 atm

Correct Answer: B

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