Oxidation Number Revision

Another name for a "oxidation-reduction" reaction is

• chemical reaction

• neutralization reaction

• redox reaction

• nuclear reaction

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

What is the oxidation number of chlorine in HClO?

• 0

• -1

• +1

• +5

What is the oxidation number of iodine in KIO₃?

• 0

• -1

• +5

• +1

Determine the oxidation number of chromium in CrO₄^2-.

• +6

• 0

• +2

• +3

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-

• Pb⁴⁺ + 2e^- →Pb²⁺

• 2O^-2 →O₂ + 4e^-

• Fe + 3e^- →Fe³⁺

In the reaction Zn + 2HCl --> ZnCl₂ + H₂

which element, if any, is oxidized?

• Zinc

• Hydrogen

• Chlorine

• None

Which of the following represents oxidation?

• C → CH₄

• Fe³⁺ → Fe²⁺

• Cl₂ → 2Cl^-

• Zn → ZnO

What is the oxidation number of sulfur in H₂SO₄?

• +6

• +4

• -2

• 0