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POST UTME BABCOCK UNIVERSITY 2018 Chemistry | Objective

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Question 1 View Details

Determine the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 2 View Details

A polymer has a molecular weight of 50000 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?

A. 0.05 g/L

Correct B. 0.1 g/L

C. 0.2 g/L

D. 0.5 g/L

Correct Answer: B

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Question 3 View Details

A 2.5 M solution of NaOH is titrated with 0.5 M HCl. What is the pH of the solution after 25 mL of HCl has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 4 View Details

A 1.0 M solution of H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 5 View Details

A 2.0 M solution of HCl is titrated with 0.5 M NaOH. What is the pH of the solution after 30 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 6 View Details

The electronegativity of an element is a measure of its ability to attract electrons in a covalent bond. Which of the following elements has the highest electronegativity among the given options?

Correct A. Fluorine (F)

B. Chlorine (Cl)

C. Bromine (Br)

D. Iodine (I)

Correct Answer: A

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Question 7 View Details

A sample of a non-metallic element is placed in a beaker and heated in a Bunsen burner flame. The resulting compound is a white solid. What is the likely identity of the non-metallic element?

Correct A. Sulfur (S)

B. Phosphorus (P)

C. Carbon (C)

D. Silicon (Si)

Correct Answer: A

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Question 8 View Details

A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is an example of a polymer?

Correct A. Polyethylene (PE)

B. Polypropylene (PP)

C. Polyvinyl Chloride (PVC)

D. Cellulose

Correct Answer: A

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Question 9 View Details

A redox reaction involves the transfer of electrons from one species to another. Which of the following is an example of a redox reaction?

Correct A. Zn + CuSO4 → ZnSO4 + Cu

B. 2Al + Fe2O3 → Al2O3 + 2Fe

C. Ca + H2O → Ca(OH)2 + H2

D. Fe + O2 → Fe2O3

Correct Answer: A

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Question 10 View Details

A colloid is a mixture in which the particles are dispersed in a continuous phase. Which of the following is an example of a colloid?

Correct A. Milk

B. Honey

C. Blood

D. Water

Correct Answer: A

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Question 11 View Details

Calculate the s\tandard enthalpy of formation of CO2(g) from the following data: ΔHf(CO2(g)) = -393.5 kJ/mol, ΔHf(C(s)) = -394.4 kJ/mol, ΔHf(O2(g)) = 0 kJ/mol.

A. -393.5 kJ/mol

B. -394.4 kJ/mol

Correct C. -393.5 kJ/mol + 394.4 kJ/mol

D. 0 kJ/mol

Correct Answer: C

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Question 12 View Details

Identify the type of polymerization reaction that occurs in the following equation: CH2=CH-CH3 + CH2=CH-CH3 → [-CH2-CH2-CH2-CH2-]n.

Correct A. Addition Polymerization

B. Condensation Polymerization

C. Ring-Opening Polymerization

D. Step-Growth Polymerization

Correct Answer: A

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Question 13 View Details

A 2.5 M solution of HCl is titrated with 1.0 M 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 14 View Details

The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the s\tandard enthalpy of formation of N2(g) + 3H2(g) → 2NH3(g)?

A. -45.9 kJ/mol

Correct B. -45.9 kJ/mol + 3\( 0 kJ/mol \)

C. -45.9 kJ/mol + 3\( 45.9 kJ/mol \)

D. -45.9 kJ/mol - 3\( 45.9 kJ/mol \)

Correct Answer: B

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Question 15 View Details

A 1.0 M solution of H2SO4 is titrated with 1.0 M 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 16 View Details

Calculate the s\tandard enthalpy of formation of NH3(g) from the following data: ΔHf(NH3(g)) = ΔHf(H2(g)) + ΔHf(N2(g)) - ΔHf(NH3(g))

Correct A. -46.1 kJ/mol

B. -92.2 kJ/mol

C. -46.1 kJ/mol

D. -92.2 kJ/mol

Correct Answer: A

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Question 17 View Details

A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 atm

B. 2.02 atm

C. 0.5 atm

Correct D. 1.01 atm

Correct Answer: D

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Question 18 View Details

A 25% solution of sulfuric acid is to be diluted to a 10% solution by adding water. If 250 mL of the 25% solution is used, how many mL of water must be added?

A. 250 mL

B. 500 mL

Correct C. 750 mL

D. 1000 mL

Correct Answer: C

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Question 19 View Details

A sample of a non-metallic oxide has a mass of 25.0 g and a volume of 2.5 L. If the density of the oxide is 2.5 g/L, what is the molar mass of the oxide?

A. 50 g/mol

B. 100 g/mol

Correct C. 150 g/mol

D. 200 g/mol

Correct Answer: C

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Question 20 View Details

A 2.0 M solution of NaOH is to be diluted to a 0.5 M solution by adding water. If 250 mL of the 2.0 M solution is used, how many mL of water must be added?

A. 250 mL

Correct B. 500 mL

C. 750 mL

D. 1000 mL

Correct Answer: B

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Question 21 View Details

The reaction between sodium hydroxide and acetic acid is a classic example of a reaction that is catalyzed by a strong acid. Which of the following is the correct equation for this reaction?

Correct A. CH3COOH + NaOH → CH3COONa + H2O

B. CH3COOH + NaOH → CH3COONa + H2O + NaOH

C. CH3COOH + NaOH → CH3COONa + H2O + Na

D. CH3COOH + NaOH → CH3COONa + H2O + O2

Correct Answer: A

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Question 22 View Details

A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of a polymer?

Correct A. It has a high melting point

B. It has a low melting point

C. It is soluble in water

D. It is insoluble in water

Correct Answer: A

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Question 23 View Details

The atomic structure of an atom consists of a nucleus surrounded by electrons. Which of the following is a characteristic of the nucleus?

Correct A. It is positively charged

B. It is negatively charged

C. It is neutral

D. It is positively and negatively charged

Correct Answer: A

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Question 24 View Details

The reaction between hydrogen gas and oxygen gas is a classic example of a reaction that is catalyzed by a catalyst. Which of the following is the correct equation for this reaction?

Correct A. 2H2 + O2 → 2H2O

B. 2H2 + O2 → 2H2O + H2O

C. 2H2 + O2 → 2H2O + O2

D. 2H2 + O2 → 2H2O + H2

Correct Answer: A

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Question 25 View Details

A biomolecule is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of a biomolecule?

Correct A. It has a high melting point

B. It has a low melting point

C. It is soluble in water

D. It is insoluble in water

Correct Answer: A

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