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POST UTME SKYLINE UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME SKYLINE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

The reaction of nitrogen dioxide with water is a classic example of an environmental chemistry process. Which of the following is the correct equation for this reaction?

A. \( 2NO_2 + H_2O \rightarrow HNO_3 + NO \)

Correct B. \( 2NO_2 + H_2O \rightarrow HNO_3 + HNO_2 \)

C. \( 2NO_2 + H_2O \rightarrow HNO_3 + O_2 \)

D. \( 2NO_2 + H_2O \rightarrow HNO_3 + NO_2 \)

Correct Answer: B

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Question 2

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

A. \( CH_4 \)

B. \( C_6H_12O_6 \)

Correct C. \( C_2H_4 \ \)_n )

D. \( H_2O \)

Correct Answer: C

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Question 3

The diagram below shows a titration setup.

Correct A. \( HCl + NaOH \rightarrow NaCl + H_2O \)

B. \( H_2SO_4 + NaOH \rightarrow Na_2SO_4 + H_2O \)

C. \( HNO_3 + NaOH \rightarrow NaNO_3 + H_2O \)

D. \( H_3PO_4 + NaOH \rightarrow Na_3PO_4 + H_2O \)

Correct Answer: A

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Question 4

The sulfur cycle is an impor\tant environmental chemistry process. Which of the following is a key step in the sulfur cycle?

A. \( SO_2 + H_2O \rightarrow H_2SO_4 \)

Correct B. \( SO_2 + O_2 \rightarrow SO_3 \)

C. \( SO_2 + H_2O \rightarrow H_2S \)

D. \( SO_2 + O_2 \rightarrow SO_4^{2-} \)

Correct Answer: B

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Question 5

The diagram below shows a chemical apparatus setup.

Correct A. \( HCl + NaOH \rightarrow NaCl + H_2O \)

B. \( H_2SO_4 + NaOH \rightarrow Na_2SO_4 + H_2O \)

C. \( HNO_3 + NaOH \rightarrow NaNO_3 + H_2O \)

D. \( H_3PO_4 + NaOH \rightarrow Na_3PO_4 + H_2O \)

Correct Answer: A

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Question 6

A redox reaction involves the transfer of electrons from a species with a higher reduction potential to a species with a lower reduction potential. Which of the following reactions represents a redox reaction?

A. 2Na(s) + Cl2(g) → 2NaCl(s)

B. Ca(s) + 2HCl(aq) → CaCl2(aq) + H2(g)

Correct C. Fe(s) + Cu2+(aq) → Fe2+(aq) + Cu(s)

D. H2(g) + F2(g) → 2HF(g)

Correct Answer: C

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Question 7

The s\tandard reduction potential of the Cu2+/Cu couple is +0.34 V. What is the s\tandard reduction potential of the Cu+/Cu couple?

Correct A. +0.17 V

B. +0.34 V

C. +0.51 V

D. +0.68 V

Correct Answer: A

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Question 8

A sample of a non-metallic element has a mass of 25.0 g and a volume of 5.00 cm3. What is the density of the element?

A. 2.50 g/cm3

Correct B. 5.00 g/cm3

C. 10.0 g/cm3

D. 25.0 g/cm3

Correct Answer: B

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Question 9

A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 cm3 of water. What is the molarity of the solution?

A. 0.100 M

Correct B. 0.200 M

C. 0.500 M

D. 1.00 M

Correct Answer: B

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Question 10

A mixture of 25.0 g of NaCl and 15.0 g of KCl is dissolved in 250 cm3 of water. What is the molarity of the solution?

A. 0.100 M

B. 0.200 M

Correct C. 0.500 M

D. 1.00 M

Correct Answer: C

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Question 11

A polymer is composed of repeating units called monomers. If a polymer has a molecular weight of 100,000 g/mol and is composed of 500 monomers, what is the average molecular weight of each monomer?

A. 150

Correct B. 200

C. 250

D. 300

Correct Answer: B

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Question 12

A solution of HCl is titrated with NaOH. If 25 mL of 1 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?

A. 0.5 M

Correct B. 1 M

C. 2 M

D. 5 M

Correct Answer: B

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Question 13

A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.5 atm, what is the mole \fraction of CO2 in the gas mixture?

A. 0.2

Correct B. 0.5

C. 0.8

D. 1.0

Correct Answer: B

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Question 14

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 15

A sample of a metal oxide is heated in a crucible until it reaches a temperature of 1000°C. If the mass of the oxide is 50 g, what is the mass of the metal that is produced?

A. 20 g

Correct B. 25 g

C. 30 g

D. 40 g

Correct Answer: B

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Question 16

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. -1206.60 kJ/mol

B. -1206.61 kJ/mol

C. -1206.59 kJ/mol

D. -1206.62 kJ/mol

Correct Answer: A

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Question 17

A 0.500 M solution of HCl is titrated with 0.500 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the pH of the solution at this point?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 18

A polymer has a degree of polymerization (n) of 1000. If the molar mass of the monomer is 100 g/mol, what is the molar mass of the polymer?

Correct A. 100,000 g/mol

B. 100,000.1 g/mol

C. 100,000.2 g/mol

D. 100,000.3 g/mol

Correct Answer: A

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Question 19

A gas at 25°C and 1 atm is compressed to 2 atm. If the initial volume is 2.00 L, what is the final volume?

A. 1.00 L

Correct B. 1.50 L

C. 2.00 L

D. 2.50 L

Correct Answer: B

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Question 20

A 1.00 M solution of H2SO4 is titrated with 1.00 M NaOH. If 20.0 mL of NaOH is required to reach the equivalence point, what is the pH of the solution at this point?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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