What is the oxidation state of hydrogen in H2O and H2O2 respectively?

The oxidation state of hydrogen in H2O and H2O2 is +1.

Explanation

  • Oxidation state indicates the degree of oxidation for an atom in a chemical compound
  • The higher the oxidation state of a given atom, the greater is its degree of oxidation; the lower the oxidation state, the greater is its degree of reduction.
  • In hydrogen peroxide, each hydrogen still has an oxidation number of +1 because each hydrogen gives up a single electron to oxygen. Oxygen has an oxidation number of -1 because each oxygen gains just one electron from its neighbouring hydrogen.
  • In water, hydrogen has an oxidation number of +1 because each hydrogen has lost one electron. Oxygen has an oxidation number of +2 because the single oxygen atom has gained a total of two electrons, one from each hydrogen.

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