Chapter 12 Multiple-choice questions

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. The species OH^- is a nucleophile. True or false?

True correct incorrect

False correct incorrect

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. Which of the following statements correctly describes the process of oxidation?

The loss (or donation) of electrons to another species correct incorrect

The acceptance of electrons from another species correct incorrect

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. Which of the following molecules acts as an electron carrier in biological systems?

Haemoglobin correct incorrect

CO₂ correct incorrect

ATP correct incorrect

NAD⁺ correct incorrect

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. Which of the following bonds is most likely to break homolytically?

H-Cl correct incorrect

Cl-Cl correct incorrect

C-Cl correct incorrect

C-H correct incorrect

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. NAD⁺ associates with the enzyme lactate dehydrogenase to catalyse the oxidation of malate. What term is used to describe NAD⁺ in this context?

Prosthetic group correct incorrect

Coenzyme correct incorrect

Functional group correct incorrect

Intermediate correct incorrect

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. Which of the following is an example of a redox reaction?

NAD⁺ + H⁺ + 2e^- → NADH correct incorrect

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O correct incorrect

Ca → Ca²⁺ correct incorrect

2Br^- → Br₂ correct incorrect

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. When an O-H bond breaks heterolytically, to which atom does the valence electron pair move?

H correct incorrect

O correct incorrect

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. The stoichiometry of a reaction tells us which of the following?

The rate at which a reaction occurs. correct incorrect

The number of steps in the reaction. correct incorrect

The concentration of reactants present. correct incorrect

The relative quantities of reactants that react, and the relative quantities of product that are formed. correct incorrect

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. The cofactor flavin adenine dinucleotide (FAD) is an electron carrier. Is FADH₂ the oxidised or reduced form of FAD?

Oxidised correct incorrect

Reduced correct incorrect

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. Which of the following statements regarding free radicals is false?

Free radicals carry a single, unpaired electron correct incorrect

Free radicals are produced as the result of homolytic cleavage of a covalent bond correct incorrect

A free radical can interact with a molecule to generate a new free radical species correct incorrect

Free radicals do not occur naturally in the body correct incorrect

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. Which of the following species acts as the strongest reducing agent?

H⁺, E° = 0.00v correct incorrect

Ca²⁺, E° = -2.87v correct incorrect

Fe²⁺, E° = -0.44v correct incorrect

Fe³⁺, E° = 0.77v correct incorrect

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. If the oxidation number of carbon changes from +4 to -4 during the course of a reaction, has it been oxidised or reduced?

Oxidised correct incorrect

Reduced correct incorrect

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. Propane reacts with oxygen according to the following reaction equation. If we start with 30g of propane, how many moles of carbon dioxide will be yielded by the reaction?

C₃H₈ + 5O₂ → 4H₂O + 3CO₂

1.47 mol correct incorrect

0.68 mol correct incorrect

4.41 mol correct incorrect

2.04 mol correct incorrect

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. The following reaction equation is balanced. True or false?

C₂H₆ + ½O₂ → CH₃CH₂OH

True correct incorrect

False correct incorrect