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POST UTME BELLS UNIVERSITY 2022 Chemistry | Objective

Are you preparing for POST UTME BELLS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of moles of oxygen gas (O2) required to react completely with 2.50 moles of propane (C3H8) according to the balanced equation: 2C3H8 + 19O2 → 12CO2 + 14H2O.

A. 0.50 mol

Correct B. 1.00 mol

C. 1.50 mol

D. 2.00 mol

Correct Answer: B

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Question 2

A 25.0 mL sample of 0.100 M HCl is titrated with 0.0500 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.

A. 1.70

B. 2.30

Correct C. 2.70

D. 3.30

Correct Answer: C

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Question 3

A diagram of a titration setup is shown below. If the burette contains 0.100 M HCl and the flask contains 25.0 mL of 0.0500 M NaOH, what is the pH of the solution after the addition of 15.0 mL of HCl?

A. 1.70

B. 2.30

Correct C. 2.70

D. 3.30

Correct Answer: C

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Question 4

A 0.500 g sample of a polymer is dissolved in 25.0 mL of solvent. If the resulting solution has a vis\cosity of 0.800 Pa·s, what is the molar mass of the polymer?

A. 500 g/mol

Correct B. 1000 g/mol

C. 2000 g/mol

D. 5000 g/mol

Correct Answer: B

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Question 5

A diagram of a molecule is shown below. If the molecule has a molecular formula of C6H12O6, what is the type of bond between the oxygen atom and the carbon atom labeled A?

A. \single bond

B. double bond

Correct C. triple bond

D. hydrogen bond

Correct Answer: C

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Question 6

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate 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. -241.8 kJ/mol

C. -393.5 kJ/mol

D. -285.8 kJ/mol

Correct Answer: A

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Question 7

A solution contains 0.2 M NaCl. What is the concentration of Cl- ions in the solution?

A. 0.2 M

Correct B. 0.1 M

C. 0.4 M

D. 0.3 M

Correct Answer: B

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Question 8

The s\tandard enthalpy of combustion of methane is -890.3 kJ/mol. What is the s\tandard enthalpy of formation of methane?

Correct A. -74.8 kJ/mol

B. -890.3 kJ/mol

C. -393.5 kJ/mol

D. -74.8 kJ/mol

Correct Answer: A

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Question 9

A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. What is the concentration of OH- ions in the resulting solution?

A. 2.0 M

Correct B. 1.0 M

C. 0.5 M

D. 0.25 M

Correct Answer: B

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Question 10

The s\tandard enthalpy of formation of H2O(g) is -241.8 kJ/mol. What is the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?

Correct A. 0 kJ/mol

B. -241.8 kJ/mol

C. -393.5 kJ/mol

D. 0 kJ/mol

Correct Answer: A

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Question 11

The reaction of 1-bu\tanol with concentrated sulfuric acid produces a compound with the molecular formula C4H9OS. Identify the product.

Correct A. Butyl hydrogen sulfate

B. Butyl sulfate

C. Butyl sulfite

D. Butyl sulfonic acid

Correct Answer: A

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Question 12

A sample of polystyrene has a density of 1.05 g/cm^3. If 25.0 g of the polymer is dissolved in 100.0 mL of toluene, what is the molar mass of the polymer?

A. 50000 g/mol

Correct B. 60000 g/mol

C. 70000 g/mol

D. 80000 g/mol

Correct Answer: B

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Question 13

The diagram below shows a titration setup. Identify the part labeled 'A'.

Correct A. Burette

B. Beaker

C. Conical flask

D. Burette s\tand

Correct Answer: A

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Question 14

The reaction of 1-propanol with concentrated sulfuric acid produces a compound with the molecular formula C3H7OS. Identify the product.

Correct A. Propyl hydrogen sulfate

B. Propyl sulfate

C. Propyl sulfite

D. Propyl sulfonic acid

Correct Answer: A

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Question 15

A sample of polyethylene has a density of 0.95 g/cm^3. If 30.0 g of the polymer is dissolved in 150.0 mL of xylene, what is the molar mass of the polymer?

A. 40000 g/mol

B. 50000 g/mol

Correct C. 60000 g/mol

D. 70000 g/mol

Correct Answer: C

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Question 16

Determine the solubility of BaSO4 in 0.1 M Na2SO4 solution, given that the solubility product cons\tant (Ksp) for BaSO4 is 1.1 x 10^-10. Assume that the concentration of Ba2+ ions in the solution is 0.01 M.

Correct A. 1.1 x 10^-7 M

B. 1.1 x 10^-6 M

C. 1.1 x 10^-5 M

D. 1.1 x 10^-4 M

Correct Answer: A

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Question 17

A sample of a non-metallic oxide, X2O3, has a mass of 25.0 g. If the molar mass of X2O3 is 160 g/mol, calculate the number of moles of X2O3 present in the sample.

Correct A. 0.156 mol

B. 0.1565 mol

C. 0.1569 mol

D. 0.1573 mol

Correct Answer: A

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Question 18

A metal, M, reacts with dilute hydrochloric acid to produce a gas, H2. The reaction is as follows: M + 2HCl -> MCl2 + H2. If 2.5 g of M reacts with 10 mL of 1 M HCl, calculate the volume of H2 produced at STP.

A. 0.5 L

B. 0.75 L

Correct C. 1.0 L

D. 1.25 L

Correct Answer: C

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Question 19

A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. Calculate the pH of the resulting solution.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 20

A diagram of a titration setup is shown below. If the volume of the burette is 50 mL and the volume of the titrant added is 25 mL, calculate the concentration of the analyte.

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 21

The element with atomic number 12 is classified as a metal in the periodic table. Which of the following is a characteristic of this metal?

Correct A. It is a good conductor of electricity.

B. It is a poor conductor of electricity.

C. It is a noble gas.

D. It is a ha\logen.

Correct Answer: A

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Question 22

In the extraction of metals from their ores, which of the following processes involves the use of a reducing agent?

A. Roasting

B. Calcination

Correct C. Smelting

D. Electrolysis

Correct Answer: C

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Question 23

The reaction between sodium hydroxide and hydrochloric acid is a type of acid-base reaction. What is the product of this reaction?

Correct A. Sodium chloride and water

B. Sodium hydroxide and hydrochloric acid

C. Sodium carbonate and hydrogen chloride

D. Sodium sulfate and water

Correct Answer: A

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Question 24

The process of removing impurities from a solution is known as?

A. Crystallization

B. Distillation

Correct C. Filtration

D. Evaporation

Correct Answer: C

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Question 25

The compound with the molecular formula C2H6O is classified as?

A. Aldehyde

B. Ester

Correct C. Alcohol

D. Ketone

Correct Answer: C

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