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POST UTME BOWEN UNIVERSITY 2018 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 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

A reaction is carried out at cons\tant pressure and temperature. The reaction is exothermic and has a negative ΔH value. Which of the following statements is correct?

Correct A. The reaction is spon\taneous.

B. The reaction is non-spon\taneous.

C. The reaction is at equilibrium.

D. The reaction has a positive ΔS value.

Correct Answer: A

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Question 2

A solution contains 0.5 M NaCl. If 10 mL of this solution is diluted to 100 mL, what is the concentration of the resulting solution?

Correct A. 0.05 M

B. 0.5 M

C. 1 M

D. 5 M

Correct Answer: A

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Question 3

A diagram of a titration setup is shown below.

A. The burette contains the acid.

Correct B. The beaker contains the acid.

C. The test tube contains the acid.

D. The burette contains the base.

Correct Answer: B

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Question 4

A reaction has a ΔH value of -50 kJ/mol and a ΔS value of 100 J/mol·K. At what temperature will the reaction be at equilibrium?

A. 298 K

Correct B. 298.15 K

C. 300 K

D. 300.15 K

Correct Answer: B

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Question 5

A diagram of a redox reaction is shown below.

Correct A. The reaction is an oxidation-reduction reaction.

B. The reaction is a combustion reaction.

C. The reaction is a synthesis reaction.

D. The reaction is a decomposition reaction.

Correct Answer: A

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Question 6

The rate cons\tant (k) of a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/\( mol*K \), and the temperature (T) is 300 K, what is the value of the rate cons\tant (k) if the pre-exponential factor (A) is 1.0 x 10^10 s^\( -1 \)?

Correct A. 1.0 x 10^\( -4 \) s^\( -1 \)

B. 1.0 x 10^\( -3 \) s^\( -1 \)

C. 1.0 x 10^\( -2 \) s^\( -1 \)

D. 1.0 x 10^\( -1 \) s^\( -1 \)

Correct Answer: A

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Question 7

A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 8

A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?

A. 200 g/mol

Correct B. 400 g/mol

C. 600 g/mol

D. 800 g/mol

Correct Answer: B

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Question 9

A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the volume of HCl required to reach the equivalence point?

A. 50 mL

Correct B. 100 mL

C. 150 mL

D. 200 mL

Correct Answer: B

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Question 10

A diagram of a titration setup is shown below. 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 11

A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?

Correct A. 0.1 M

B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: A

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Question 12

The s\tandard Gibbs free energy change for the reaction 2Ag+(aq) + 2e- → Ag(s) is -0.80 V. What is the equilibrium cons\tant (K) for the reaction?

Correct A. 10^\( -0.80 \)

B. 10^0.80

C. 10^\( -1.60 \)

D. 10^1.60

Correct Answer: A

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Question 13

A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 100 mL of water. What is the concentration of the solution in mol/L?

Correct A. 1.0 M

B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: A

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Question 14

The s\tandard Gibbs free energy change for the reaction 2Ag+(aq) + 2e- → Ag(s) is -0.80 V. What is the equilibrium cons\tant (K) for the reaction?

Correct A. 10^\( -0.80 \)

B. 10^0.80

C. 10^\( -1.60 \)

D. 10^1.60

Correct Answer: A

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Question 15

A 1.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 100 mL of water. What is the concentration of the solution in mol/L?

Correct A. 1.0 M

B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: A

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Question 16

Calculate the s\tandard enthalpy change (ΔH) for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). Given that the s\tandard enthalpy of formation (ΔHf) for Al2O3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe(s) is 0 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and for Fe2O3(s) is -826.4 kJ/mol.

Correct A. -1651.1 kJ/mol

B. -1675.7 kJ/mol

C. -826.4 kJ/mol

D. -1651.1 kJ/mol + 826.4 kJ/mol

Correct Answer: A

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Question 17

A polymer has a molecular weight of 100,000 g/mol. If the polymer has a degree of polymerization (DP) of 500, what is the molecular weight of the repeating unit?

A. 200 g/mol

Correct B. 100 g/mol

C. 500 g/mol

D. 50 g/mol

Correct Answer: B

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Question 18

The pH of a solution is 4.5. What is the concentration of hydrogen ions \( H+ \) in the solution?

Correct A. 1.0 × 10^-5 M

B. 1.0 × 10^-4 M

C. 1.0 × 10^-3 M

D. 1.0 × 10^-6 M

Correct Answer: A

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Question 19

A solution contains 0.5 M HCl and 0.5 M NaOH. What is the concentration of H+ ions in the solution after mixing?

A. 0.5 M

B. 1.0 M

Correct C. 0.25 M

D. 0.75 M

Correct Answer: C

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Question 20

A sample of a polymer has a molecular weight of 50,000 g/mol. If the polymer has a degree of polymerization (DP) of 200, what is the molecular weight of the repeating unit?

A. 250 g/mol

Correct B. 50 g/mol

C. 200 g/mol

D. 100 g/mol

Correct Answer: B

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Question 21

A solution contains 0.2 M HCl and 0.2 M NaOH. What is the concentration of H+ ions in the solution after mixing?

A. 0.2 M

B. 0.4 M

Correct C. 0.1 M

D. 0.3 M

Correct Answer: C

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Question 22

A sample of a polymer has a molecular weight of 20,000 g/mol. If the polymer has a degree of polymerization (DP) of 100, what is the molecular weight of the repeating unit?

A. 200 g/mol

Correct B. 20 g/mol

C. 100 g/mol

D. 50 g/mol

Correct Answer: B

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Question 23

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the concentration of H+ ions in the solution after mixing?

A. 0.1 M

B. 0.2 M

Correct C. 0.05 M

D. 0.15 M

Correct Answer: C

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Question 24

A sample of a polymer has a molecular weight of 10,000 g/mol. If the polymer has a degree of polymerization (DP) of 50, what is the molecular weight of the repeating unit?

A. 200 g/mol

B. 10 g/mol

C. 50 g/mol

D. 25 g/mol

Correct Answer: VIEW ANSWER

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Question 25

Determine the number of moles of oxygen gas (O2) required to react with 2.5 moles of carbon monoxide (CO) in the following equation: 2CO + O2 → 2CO2.

Correct A. 1.25 moles

B. 2.5 moles

C. 5 moles

D. 10 moles

Correct Answer: A

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