Redox and Electrochemistry

In a redox reaction, the species that loses electrons

• is called the cathode

• is oxidized

• gains mass at the electrode

• decreases in oxidation number

As an element is oxidized, its oxidation number

• decreases as electrons are lost

• increases as electrons are lost

• decreases as electrons are gained

• increases as electrons are gained

The reaction 2NaCl → 2Na + Cl₂ is an example of

• a reduction reaction, only

• both an oxidation and reduction reaction

• an oxidation reaction, only

• neither an oxidation nor a reduction reaction

Mg + PbCl₂ → MgCl₂ + Pb

Which statement correctly describes the oxidation and reduction that occur?

• Mg is oxidized and Pb⁺² is reduced

• Mg is oxidized and Cl^- is reduced

• Mg is reduced and Cl^- is oxidized

• Mg is reduced and Pb⁺² is oxidized

In the reactions

Sn⁺² + 2Fe⁺³ --> Sn⁺⁴ + 2Fe⁺²,

the species that is oxidized is

• Fe⁺³

• Sn⁺²

• Sn⁺⁴

• Fe⁺²

Pb + 2Ag⁺ → Pb⁺² + 2Ag

The chemical species being reduced is

• Ag

• Pb

• Pb⁺²

• Ag⁺

In the reactions

Sn⁺² + 2Fe⁺³ → Sn⁺⁴ + 2Fe⁺²

the species that is reduced is

• Sn⁺⁴

• Sn⁺²

• Fe⁺³

• Fe⁺²

An electrolytic cell uses electrical energy to drive

• chemical reaction

• physical reaction

• no reaction

• none of above

In electrolysis, particles which move towards cathode are called

• anions

• cations

• photons

• positrons

What is a redox reaction?

• A reaction where both reactants get reduced.

• A reaction where both reactants get oxidized.

• A reaction that involves a transfer of electrons between reactants.

• A reaction that involves the combustion of at least one reactant.