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Cr(VI) should have no unpaired electrons and have no color, but when bound to oxygen, charge transfer occurs from the O 2-. CrO4 (chromate) has four oxygens which all charge transfer to the Chromium giving orange color. In Cr2O7 (dichromate) one oxygen bridges between the two Chromium atoms so each only gets charge transfer from three oxygens. Cr(VI) should have no unpaired electrons and have no color, but when bound to oxygen, charge transfer occurs from the O 2-. CrO4 (chromate) has four oxygens which all charge transfer to the Chromium giving orange color. In Cr2O7 (dichromate) one oxygen bridges between the two Chromium atoms so each only gets charge transfer from three oxygens.

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Q: In potassium dichromate and potassium chromate the oxidation state of chromium is 6 but both have different colors?
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Related questions

Is there any way to make lead chromate?

by the reaction of lead nitrate with potassium chromate or potassium dichromate


What is the name of this formula k2CrO4?

KCrO4 does not exist it is K2CrO4 and is called Potassium Chromate. Potassium dichromate is K2Cr2O7


What the name of K2CrO4?

Potassium chromate K2Cr(VI)O4 Indicates the oxidation state of the chromium component.


Symbol for dichromate?

Potassium chromate is K2CrO4 Potassium dichromate is K2Cr2O7


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I think Potassium chromate is not used in medicines. However, Potassium dichromate is used in making a homeopathic medicine called Kali Bichromicum


What is the chemical formula of potassium chromate?

This is a mixture of 2K+ and Cr2O72- ions in strong sulfuric acid.2CrO4- + 2H+ ----> Cr2O72- + H2Ochromate-yellow -> dichromate-orangeNote:Potassium ions do NOT react, they are tribune-ions


What is the chemical name of SnCr2O7?

The name of SnCrO4 is Tin II Chromate or stannous chromate.


How chromate ions are converted into dichromate ions?

In an acidic solution chromate ions are converted into dichromate ions.


What is the name for PbCr2O7?

Lead (II) Dichromate


Chemical formula for potassium and chromate?

Reaction of Potassium hydroxide or any potassium salt of a weak acid with chromic acid produces Potassium chromate. KOH + H2CrO4 ----> K2CrO4 + H2O K+ + H2CrO4 ----> K2CrO4 + H+


What is the chemical name of ZnCrO4?

It is Ferrous chromate or Iron (II) chromate .


What is Na2CrO4 3H2O?

Na2Cr2O7 (the formula is not Na2CrO7) is sodium dichromate. Na2CrO4 is sodium chromate.