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Redox reactions

Last updated 10 months ago
8 questions
1

In the reaction H2 + O2 ➝ H2O hydrogen gets:

1

In this compound the oxidation number of chlorine is:

1

The oxidation number of nitrogen in this ion is:

5

Zn + HgO → ZnO2 + Hg

Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers.
Note that not all of the listed substances need to be used and some may be used more than once.

  • Zn
  • Zn2+ ions
  • Hg
  • Hg2+ ions
  • O
  • O2- ions
  • Substance being oxidised
  • Substance being reduced
  • Spectator ion
  • Oxidising agent
  • Reducing agent
5

4FeCl3 + 3C → 4Fe + 3CCl4

Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers.
Note that not all of the listed substances need to be used and some may be used more than once.

  • Fe
  • Fe2+ ions
  • Fe3+ ions
  • Cl
  • Cl- ions
  • C
  • C2+ ions
  • C4+ ions

  • Substance being oxidised
  • Substance being reduced
  • Spectator ion
  • Oxidising agent
  • Reducing agent
1

In a spontaneous reaction, which of the following metals would most readily donate its electrons?

2

For the following redox reaction, select the appropriate oxidation and reduction half-reaction:

Zn + Fe3+ → Zn2+ + Fe2+

  • Zn → Zn2++ 2e-
  • Zn2++ 2e- → Zn
  • Fe → Fe2++ 2e-
  • Fe → Fe3++ 3e-
  • Fe2+ → Fe3++ e-
  • Fe2+ + 2e- → Fe
  • Fe3+ + 3e- → Fe
  • Fe3+ + e- → Fe2+
  • oxidation half-reaction
  • reduction half-reaction
2

Based on your answer from above:

Zn + Fe3+ → Zn2+ + Fe2+

Explain clearly how you would balance the electrons in this reaction in order to obtain the net ionic equation.