Balancing Redox Reactions using Oxidation Numbers

Key Stage 4 Science / Chemistry

Sample Question

For
the unbalanced reaction: Ag+(aq)  + Pb(s)  >  Ag(s)  + Pb2+(aq), using
Oxidation Numbers determine which species has been oxidized and reduced and by
how much. 

  • Pb(s) has been oxidized from 0 to +2 and Ag+(aq) reduced from +1 to 0
  • Pb(s) has been reduced from 0 to +2 and Ag+(aq) oxidized from +1 to 0
  • Pb2+(aq) has been oxidized from +2 to 0 and Ag(s) reduced from 0 to +1
  • Pb2+(aq) has been reduced from +2 to 0 and Ag(s) oxidized from 0 to +1
  • Pb(s) has been oxidized from 0 to +1 and Ag+(aq) reduced from +2 to 0

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Quipper School UK Curriculum

Key Stage 4 Science

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