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Selenium Dioxide Chemical Structure

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What is Selenium Dioxide?

Selenium dioxide appears as a colorless to white or cream-colored lustrous volatile crystal or crystalline powder with a distinct sour odor. Solid SeO2 is a one-dimensional polymer, the chain consisting of alternating selenium and oxygen atoms.

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PRODUCT NAME Selenium Dioxide
CAS No. 7446-08-4
SYNONYMS Selenium(IV) oxide, Selenium oxide, Oxoselane oxide
USES used as a toner in photographic developing and to create colourless glass.
Pubchem CID 24007
Pubchem SID 462770308


SR. No Criteria Limit/Specification
1 Description White to Pink
2 Appearance (Form) Powder, Crystals or Crystalline Powder
3 Gravimetric Analysis (% Se After Reduction With Sulfite) 69.4 - 72.9 %
4 X-Ray Diffraction Conforms to Structure


  • In the process of organic synthesis, Selenium Dioxide is a very useful reagent and can be used as an oxidizing agent to introduce carbonyl functional groups, as a catalyst in the allylic hydroxylation reactions and oxidative-elimination reactions, etc.
  • Selenium dioxide imparts a red color to glass. It is used in small quantities to counteract the color due to iron impurities and so to create (apparently) colorless glass.
  • In certain cold-bluing solutions, selenium dioxide serves as the active ingredient.
  • In addition to that, it was utilized in the process of photographic development as a toner.


Q. What is the chemical formula of Selenium Dioxide?

Selenium Dioxide is an inorganic compound with the chemical formula SeO2.

Q. Is Selenium Dioxide acidic?

Selenium Dioxide is an example of an acidic oxide because when dissolved in water, it produces Selenious acid.

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