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POST UTME BOWEN UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME BOWEN UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

In the context of acid-base chemistry, what is the pH of a solution that is 0.1 M in HCl?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 2

A solution contains 0.2 M H2SO4. What is the concentration of H+ ions in the solution?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 3

A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution after 10 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 4

A solution contains 0.1 M H2SO4. What is the concentration of H+ ions in the solution?

A. 0.05

Correct B. 0.1

C. 0.15

D. 0.2

Correct Answer: B

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Question 5

A 20 mL sample of 0.2 M HCl is titrated with 0.2 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 6

Calculate the s\tandard enthalpy change \( ΔH^circ \) for the reaction: 2Al(s) + Fe_2O_3(s) → 2Fe(s) + Al_2O_3(s). Given that the s\tandard enthalpy of formation \( ΔH^circ_f \) for Al_2O_3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe_2O_3(s) is -825.4 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and for Fe(s) is 0 kJ/mol.

Correct A. -1821.1 kJ/mol

B. -1821.5 kJ/mol

C. -1821.9 kJ/mol

D. -1822.3 kJ/mol

Correct Answer: A

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Question 7

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 number of moles of HCl in the original solution?

Correct A. 0.0125 mol

B. 0.0127 mol

C. 0.0129 mol

D. 0.0131 mol

Correct Answer: A

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Question 8

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?

Correct A. 250 g/mol

B. 250.5 g/mol

C. 251 g/mol

D. 251.5 g/mol

Correct Answer: A

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Question 9

A 1.00 L solution of 0.100 M NaOH is mixed with 1.00 L of 0.100 M HCl. What is the pH of the resulting solution?

Correct A. 7.00

B. 7.01

C. 7.02

D. 7.03

Correct Answer: A

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Question 10

A 2.00 L solution of 0.500 M Ca(OH)_2 is mixed with 2.00 L of 0.500 M HCl. What is the concentration of CaCl_2 in the resulting solution?

Correct A. 0.500 M

B. 0.501 M

C. 0.502 M

D. 0.503 M

Correct Answer: A

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Question 11

The reaction between nitrogen dioxide and water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. If 2.5 moles of NO2 react with an excess of water, calculate the number of moles of HNO3 produced.

A. 2.5

Correct B. 5.0

C. 7.5

D. 10.0

Correct Answer: B

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Question 12

A 2.5 M solution of sulfuric acid (H2SO4) is prepared by dissolving 125 g of H2SO4 in 1 L of water. Calculate the number of moles of H2SO4 dissolved.

A. 1.28

Correct B. 1.28

C. 1.29

D. 1.30

Correct Answer: B

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Question 13

A 2.5 M solution of sodium chloride (NaCl) is prepared by dissolving 125 g of NaCl in 1 L of water. Calculate the number of moles of NaCl dissolved.

A. 2.14

Correct B. 2.15

C. 2.16

D. 2.17

Correct Answer: B

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Question 14

A 2.5 M solution of potassium hydroxide (KOH) is prepared by dissolving 125 g of KOH in 1 L of water. Calculate the number of moles of KOH dissolved.

A. 2.23

Correct B. 2.24

C. 2.25

D. 2.26

Correct Answer: B

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Question 15

A 2.5 M solution of calcium chloride (CaCl2) is prepared by dissolving 125 g of CaCl2 in 1 L of water. Calculate the number of moles of CaCl2 dissolved.

A. 1.13

Correct B. 1.14

C. 1.15

D. 1.16

Correct Answer: B

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Question 16

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy change for the reaction: 2CO(g) + O2(g) → 2CO2(g).

Correct A. -786 kJ/mol

B. -393.5 kJ/mol

C. 0 kJ/mol

D. 786 kJ/mol

Correct Answer: A

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Question 17

A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 atm

Correct B. 2.02 atm

C. 3.03 atm

D. 4.04 atm

Correct Answer: B

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Question 18

The atomic radius of an element is 100 pm. If the element has an atomic number of 12, what is its electron configuration?

Correct A. [Ne] 3s^2 3p^6

B. [Ne] 3s^2 3p^6 4s^2

C. [Ne] 3s^2 3p^6 4s^1

D. [Ne] 3s^2 3p^6 4s^2 4p^1

Correct Answer: A

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Question 19

A solution contains 10 g of NaCl in 100 g of water. Calculate the molality of the solution.

A. 0.1 m

Correct B. 0.2 m

C. 0.3 m

D. 0.4 m

Correct Answer: B

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Question 20

A 1.0 M solution of HCl is titrated with 0.5 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 21

Determine the pH of a 0.1 M solution of HCl.

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 22

A 2.5 g sample of a metal oxide is heated in a crucible to produce 1.2 g of the metal. What is the percentage yield of the metal?

A. 60%

B. 70%

Correct C. 80%

D. 90%

Correct Answer: C

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Question 23

A solution containing 0.1 M HCl and 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 20 mL of HCl has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 24

A 2.5 g sample of a metal oxide is heated in a crucible to produce 1.2 g of the metal. What is the percentage yield of the metal?

A. 60%

B. 70%

Correct C. 80%

D. 90%

Correct Answer: C

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Question 25

A solution containing 0.1 M HCl and 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 20 mL of HCl has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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