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POST UTME BOWEN UNIVERSITY 2017 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 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the oxidation state of chromium in the compound K2Cr2O7.

A. +3

B. +2

Correct C. +6

D. +1

Correct Answer: C

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Question 2

A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

A. 0.0500 M

Correct B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: B

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Question 3

The half-life of a radioactive subs\tance is 5.0 days. If a sample initially contains 1000 mg of the subs\tance, how much will remain after 20 days?

Correct A. 250 mg

B. 500 mg

C. 750 mg

D. 1000 mg

Correct Answer: A

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Question 4

A diagram of a simple electric circuit is shown below. If the battery has a voltage of 12 V and the resis\tance of the circuit is 4.0 Ω, what is the current flowing through the circuit?

A. 1.5 A

Correct B. 2.0 A

C. 3.0 A

D. 4.0 A

Correct Answer: B

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Question 5

The solubility of a subs\tance in water is 0.50 g/100 mL at 20°C. If 100 mL of water is added to 1.0 g of the subs\tance, what is the concentration of the solution?

A. 0.25 g/100 mL

Correct B. 0.50 g/100 mL

C. 0.75 g/100 mL

D. 1.0 g/100 mL

Correct Answer: B

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Question 6

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 Na+ ions in the solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.25 M

Correct Answer: B

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Question 7

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

Correct A. -110.5 kJ/mol

B. -393.5 kJ/mol

C. -74.8 kJ/mol

D. 74.8 kJ/mol

Correct Answer: A

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Question 8

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 H+ ions in the solution?

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 2.0 M

Correct Answer: C

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Question 9

The s\tandard entropy change for the reaction 2H2(g) + O2(g) → 2H2O(l) is 143.6 J/K·mol. What is the s\tandard entropy change for the reaction H2(g) + 1/2O2(g) → H2O(l)?

Correct A. 71.8 J/K·mol

B. 143.6 J/K·mol

C. 214.4 J/K·mol

D. 428.8 J/K·mol

Correct Answer: A

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Question 10

A 0.1 M solution of NaOH is prepared by dissolving 4.0 g of NaOH in 100 mL of water. What is the concentration of OH- ions in the solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.25 M

Correct Answer: B

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Question 11

A polymer is formed by the condensation reaction between two monomers, A and B, with the following molecular formula: A_nB_m. If the degree of polymerization (n) is 100 and the ratio of A to B is 2:1, what is the molecular formula of the polymer?

Correct A. A_100B_50

B. A_200B_100

C. A_50B_25

D. A_25B_12

Correct Answer: A

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Question 12

A gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?

Correct A. 76.2 mmHg

B. 23.8 mmHg

C. 1 atm

D. 760 mmHg

Correct Answer: A

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Question 13

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

Correct A. 0.25 M

B. 0.5 M

C. 1 M

D. 2 M

Correct Answer: A

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Question 14

A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. What is the half-reaction for the oxidation of Fe2+?

Correct A. Fe2+ → Fe3+ + e-

B. Fe2+ + e- → Fe3+

C. Fe3+ → Fe2+ + e-

D. Fe2+ + e- → Fe2+

Correct Answer: A

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Question 15

A diagram shows a titration setup with a burette containing 0.1 M HCl and a flask containing 25 mL of 0.05 M NaOH. If the initial pH of the solution is 7, what is the pH after the addition of 20 mL of HCl?

Correct A. pH 2

B. pH 3

C. pH 4

D. pH 5

Correct Answer: A

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Question 16

Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4)n, 20% polypropylene (C3H6)n, and 20% polyvinyl chloride (C2H3Cl)n. Given that the molar mass of polyethylene is 14.0 g/mol, the molar mass of polypropylene is 42.1 g/mol, and the molar mass of polyvinyl chloride is 62.5 g/mol.

A. 120.0 g/mol

Correct B. 150.0 g/mol

C. 180.0 g/mol

D. 210.0 g/mol

Correct Answer: B

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Question 17

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 15.0 mL of NaOH.

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 18

The reaction between benzene (C6H6) and bromine (Br2) produces a dibrominated product. Write the balanced chemical equation for this reaction and identify the major product.

Correct A. C6H5Br + C6H5Br

B. C6H5Br + C6H5Br2

C. C6H5Br + C6H5Br3

D. C6H5Br + C6H5Br4

Correct Answer: A

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Question 19

A 100.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the volume of HCl required to reach the equivalence point.

A. 50.0 mL

Correct B. 100.0 mL

C. 150.0 mL

D. 200.0 mL

Correct Answer: B

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Question 20

The diagram below shows a titration setup. Identify the burette.

Correct A. A

B. B

C. C

D. D

Correct Answer: A

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Question 21

Determine the pH of a 0.1 M solution of HCl in water at 25°C. The dissociation cons\tant for HCl is 10^\( -7 \).

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 22

A 2.5 g sample of a metal oxide is dissolved in 50 mL of 0.1 M HCl. The resulting solution is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the metal oxide?

A. 100

B. 200

C. 300

Correct D. 400

Correct Answer: D

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Question 23

A 2.0 g sample of a non-metallic element is heated in a stream of oxygen gas. The resulting product is a white solid that is soluble in water. What is the identity of the non-metallic element?

Correct A. Sulfur

B. Phosphorus

C. Chlorine

D. Bromine

Correct Answer: A

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Question 24

A 1.0 M solution of a weak acid is titrated with 1.0 M NaOH. The initial pH of the acid solution is 3.0. If 20 mL of NaOH is required to reach the equivalence point, what is the dissociation cons\tant of the acid?

A. 10^\( -5 \)

B. 10^\( -6 \)

Correct C. 10^\( -7 \)

D. 10^\( -8 \)

Correct Answer: C

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Question 25

A 2.5 g sample of a metal is dissolved in 50 mL of 0.1 M HCl. The resulting solution is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the metal?

A. 50

B. 100

C. 150

Correct D. 200

Correct Answer: D

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