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POST UTME FUTO 2017 Chemistry | Objective

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Question 1 View Details

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.

Correct A. -1785.6 kJ/mol

B. -1785.1 kJ/mol

C. -1785.9 kJ/mol

D. -1786.1 kJ/mol

Correct Answer: A

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Question 2 View Details

A polymer has a molecular weight of 50,000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?

Correct A. 0.25 g/L

B. 0.5 g/L

C. 1 g/L

D. 2 g/L

Correct Answer: A

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Question 3 View Details

A metal has a density of 8.5 g/cm^3. If a 2.5 cm^3 sample of the metal has a mass of 35 g, what is the molar mass of the metal?

A. 50 g/mol

B. 60 g/mol

C. 70 g/mol

Correct D. 80 g/mol

Correct Answer: D

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Question 4 View Details

A solution contains 2.5 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?

Correct A. 0.25 g/L

B. 0.5 g/L

C. 1 g/L

D. 2 g/L

Correct Answer: A

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Question 5 View Details

A metal has a density of 8.5 g/cm^3. If a 2.5 cm^3 sample of the metal has a mass of 35 g, what is the molar mass of the metal?

A. 50 g/mol

B. 60 g/mol

C. 70 g/mol

Correct D. 80 g/mol

Correct Answer: D

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Question 6 View Details

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. Calculate the number of moles of NaCl that will dissolve in 1 L of water.

A. 0.01 mol

B. 0.05 mol

Correct C. 0.1 mol

D. 0.2 mol

Correct Answer: C

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Question 7 View Details

The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is present initially, how much will remain after 10 days?

Correct A. 12.5 mg

B. 25 mg

C. 50 mg

D. 100 mg

Correct Answer: A

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Question 8 View Details

A 0.1 M solution of HCl is prepared by dissolving 6.0 g of HCl in 100 mL of water. Calculate the pH of the solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 9 View Details

A diagram of a titration setup is shown below. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Test Tube

Correct Answer: A

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Question 10 View Details

A 0.1 M solution of NaOH is prepared by dissolving 4.0 g of NaOH in 100 mL of water. Calculate the number of moles of NaOH that will dissolve in 1 L of water.

A. 0.01 mol

B. 0.05 mol

Correct C. 0.1 mol

D. 0.2 mol

Correct Answer: C

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Question 11 View Details

Determine the pH of a 0.01 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 12 View Details

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

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 13 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 14 View Details

A 25 mL sample of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the addition of 50 mL of HCl?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 15 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after the addition of 25 mL of 0.1 M HCl?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 16 View Details

The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. What is the oxidation state of chlorine in the product NaClO?

A. 0

B. +1

C. +2

Correct D. +3

Correct Answer: D

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Question 17 View Details

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol and that of H2(g) is 0 kJ/mol?

Correct A. -285.6 kJ/mol

B. -285.8 kJ/mol

C. -286.0 kJ/mol

D. -286.2 kJ/mol

Correct Answer: A

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Question 18 View Details

The half-life of a radioactive subs\tance is 5 days. If 100 g of the subs\tance is initially present, how much of it will remain after 15 days?

Correct A. 25 g

B. 50 g

C. 75 g

D. 100 g

Correct Answer: A

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Question 19 View Details

The diagram below shows a titration setup. 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 20 View Details

The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(g) if the s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol and that of H2(g) is 0 kJ/mol?

Correct A. -285.6 kJ/mol

B. -285.8 kJ/mol

C. -286.0 kJ/mol

D. -286.2 kJ/mol

Correct Answer: A

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Question 21 View Details

The element with atomic number 12 is classified as a metalloid. Which of the following is a characteristic of metalloids?

Correct A. They exhibit metallic as well as non-metallic properties.

B. They are highly reactive.

C. They are good conductors of electricity.

D. They are highly malleable.

Correct Answer: A

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Question 22 View Details

A 2.5 g sample of a non-metallic element was found to have a density of 5.6 g/cm³. What is the volume of the sample in cm³?

A. 0.45 cm³

B. 0.9 cm³

Correct C. 1.8 cm³

D. 2.7 cm³

Correct Answer: C

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Question 23 View Details

A solution of NaOH was prepared by dissolving 25 g of NaOH in 100 g of water. What is the molarity of the solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 24 View Details

A polymer has the following structure: [-CH₂-CH₂-]n. What is the type of polymerization reaction that occurred?

Correct A. Addition polymerization

B. Condensation polymerization

C. Ring-opening polymerization

D. Step-growth polymerization

Correct Answer: A

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Question 25 View Details

A 10 mL sample of a solution containing 0.5 M NaCl was titrated with 0.5 M AgNO₃. What is the volume of AgNO₃ required to reach the equivalence point?

A. 5 mL

Correct B. 10 mL

C. 15 mL

D. 20 mL

Correct Answer: B

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