What is a dichromate?

What is a dichromate? Here are some definitions.

Noun
  1. (chemistry) any salt of dichromic acid; in solution the orange dichromate anion (Cr2O72-) is in equilibrium with the yellow chromate anion (CrO42-), the relative amount of each ion depending on the pH; they are both very powerful oxidizing agents
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Examples
This can be carried out using chemical oxidation agents such as hydrogen peroxide, ozone, or potassium dichromate.
In all but one of the incidents, Ms Haynes avoided harm: the bright-orange potassium dichromate and the arsenic compound were easy to spot.
Ethanol can be chemically oxidized using a mixture of concentrated sulfuric acid and sodium dichromate.
The two listed active ingredients, white bryony and potassium dichromate, are diluted to.000001 PPM and 1 PPM respectively.
The equilibrium is disturbed once again, and the chromate ions react with the hydrogen ions to form dichromate ions.
He had very bad luck with the permanganate bleach and recommends the dichromate bleach instead.

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