Oxidation numbers

Oxidation can be defined as the

1) The increase in oxidation number of an atom.
2) The gaining of an oxygen atom
3) The loss of a hydrogen
4) Loss of electrons

Reduction on the other hand is defined as

1) The decrease in oxidation number
2) The gaining of an hydrogen atom
3) The loss of an oxygen atom
4) Accepting electrons.

Which of the changes pictured on the right "A" to "H" represent oxidation and which represent reduction. Give the reasons.

Solutions
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Balance for charge by adding electrons tot he most positive side. Balance for hydrogen by adding Hydrogen ions to the hydrogen deficient side. Balance for oxygen by adding water to the oxygen deficient side. Balance for Ag atoms Balance for oxygen by adding water to the oxygen deficient side. Balance for hydrogen by adding Hydrogen ions to the hydrogen deficient side. Balance for charge by adding electrons tot he most positive side. Home
Each oxygen atom has an oxidation number of -2 Each oxygen atom has an oxidation number of -2 Each potassium atom has an oxidation number of =1