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The orange color of potassium dichromate is caused by the movement of an electron to a vacant d-orbital in the manganese atom. The transition occurs when the chemical is in the presence of light. This is confirmed by the empty 3d-orbital in chromium.

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Potassium dichromate is orange-red in color because it absorbs light in the blue and green regions of the visible spectrum, reflecting red wavelengths. This selective absorption and reflection of light give potassium dichromate its distinct color.

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Q: Why potassium dichromate is orange red in color?
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What is the color of potassium chromate?

The crystals are Red and makes a Red Orange solution, when applied to wood the wood turns a light after about 30 minutes. You can see the crystals on the website of Internationalviolin.com. GR.


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K2Cr2O7 is potassium dichromate, while K2Cr2O4 is potassium chromate. K2Cr2O7 is an orange-red compound used as an oxidizing agent, while K2Cr2O4 is a yellow compound. K2Cr2O7 tends to be more powerful as an oxidizing agent compared to K2Cr2O4.


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Potassium dichromate appears orange-red due to the presence of two chromium atoms in the +6 oxidation state. On the other hand, potassium chromate appears yellow as it contains only one chromium atom in the +6 oxidation state. The difference in color is due to the different chemical environments and structures of the two compounds.


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