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POST UTME IGBINEDION UNIVERSITY 2024 Chemistry | Objective

Are you preparing for POST UTME IGBINEDION UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

The reaction of benzene with chlorine in the presence of light produces a mixture of chlorinated benzenes. The major product is chlorobenzene. What is the structure of chlorobenzene?

Correct A. C6H5Cl

B. C6H5CH2Cl

C. C6H5CHCl2

D. C6H5CCl3

Correct Answer: A

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Question 2

A 2.50 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat of combustion is found to be - 35.5 kJ/g. What is the enthalpy of formation of the hydrocarbon?

A. - 35.5 kJ/g

Correct B. - 35.5 kJ/mol

C. - 35.5 kJ/g x 2.50 g

D. - 35.5 kJ/g x 2.50 mol

Correct Answer: B

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Question 3

The s\tandard enthalpy of formation of CO2(g) is - 393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?

Correct A. - 285.8 kJ/mol

B. - 285.8 kJ/g

C. - 285.8 kJ/mol x 18 g/mol

D. - 285.8 kJ/mol x 18 mol

Correct Answer: A

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Question 4

A 2.50 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat of combustion is found to be - 35.5 kJ/g. What is the enthalpy of formation of the hydrocarbon?

A. - 35.5 kJ/g

Correct B. - 35.5 kJ/mol

C. - 35.5 kJ/g x 2.50 g

D. - 35.5 kJ/g x 2.50 mol

Correct Answer: B

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Question 5

Correct A. - 285.8 kJ/mol

B. - 285.8 kJ/g

C. - 285.8 kJ/mol x 18 g/mol

D. - 285.8 kJ/mol x 18 mol

Correct Answer: A

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Question 6

The reaction of cyclohexane with bromine in the presence of light is an example of a reaction that proceeds through a radical mechanism. What is the major product formed when 1-bromocyclohexane is treated with sodium in liquid ammonia?

Correct A. Cyclohexylamine

B. Benzene

C. Toluene

D. Ethylbenzene

Correct Answer: A

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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)?

A. -110.5 kJ/mol

B. -393.5 kJ/mol

Correct C. -110.5 kJ/mol + 283 kJ/mol

D. -393.5 kJ/mol + 283 kJ/mol

Correct Answer: C

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Question 8

A solution containing 0.10 M HCl and 0.10 M NaOH is mixed with 0.10 M NaCl. What is the concentration of HCl after the reaction?

A. 0.10 M

Correct B. 0.05 M

C. 0.20 M

D. 0.15 M

Correct Answer: B

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Question 9

The diagram below shows a titration setup. What is the concentration of the NaOH solution?

A. 0.10 M

Correct B. 0.20 M

C. 0.30 M

D. 0.40 M

Correct Answer: B

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Question 10

The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of CO2(g)?

A. -393.5 kJ/mol

B. -110.5 kJ/mol

Correct C. -393.5 kJ/mol + 283 kJ/mol

D. -393.5 kJ/mol - 110.5 kJ/mol

Correct Answer: C

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Question 11

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the equivalence point is reached at 35.0 mL of NaOH, calculate the pH of the resulting solution.

A. 3.00

Correct B. 3.50

C. 4.00

D. 4.50

Correct Answer: B

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Question 12

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of CH4(g).

Correct A. -74.8

B. -74.5

C. -74.2

D. -75.1

Correct Answer: A

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Question 13

A 2.50 g sample of a polymer is dissolved in 100.0 mL of solvent. The solution has a vis\cosity of 0.800 Pa·s. Calculate the molar mass of the polymer.

A. 1000

B. 2000

Correct C. 3000

D. 4000

Correct Answer: C

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Question 14

A 1.00 M solution of NaOH is titrated with a 1.00 M solution of HCl. If 25.0 mL of HCl is required to reach the equivalence point, calculate the pH of the resulting solution.

A. 1.00

B. 2.00

Correct C. 3.00

D. 4.00

Correct Answer: C

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Question 15

A 2.00 g sample of a gas is collected at 25.0°C and 1.00 atm. Calculate the volume of the gas in liters.

A. 0.500

Correct B. 1.00

C. 2.00

D. 4.00

Correct Answer: B

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Question 16

The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?

Correct A. 0.01 M

B. 0.02 M

C. 0.03 M

D. 0.04 M

Correct Answer: A

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Question 17

A 2.5 M solution of HCl is titrated with 0.5 M NaOH. What is 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 18

The half-life of a radioactive subs\tance is 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?

A. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 19

A metal rod of length 20 cm and cross-sectional area 1 cm^2 is connected to a 6 V battery. If the resistivity of the metal is 1.8 × 10^-8 Ωm, what is the current flowing through the rod?

A. 0.1 A

B. 0.2 A

Correct C. 0.3 A

D. 0.4 A

Correct Answer: C

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Question 20

A 1 M solution of NaOH is titrated with 0.5 M HCl. What is the pH of the solution after 50 mL of HCl has been added?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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