chemistry 12th class cbse notes

Formation of oxides of d-block elements

Transition metals form oxides on reaction with oxygen at elevated temperature. Transition metal form oxide in oxidation state of + 1 (in Ag2O) to + 7 (Mn2O7) to + 8 (in OsO4). As the oxidation number increases in case of same elements:

  • The covalent character of oxides increases.
  • The acidic strength of the oxides increases.
  • The oxidizing power of oxides increases.

For example, Cr2O3 is amphoteric while CrO is basic and CrO3 is acidic.

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