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ऑक्सेलिक अम्ल की क्रिया अम्लीय `"K"_(2)"Cr"_(2)"O"_(7)` विलयन से कराते हैं |

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ऑक्सेलिक अम्ल का ऑक्सीकरण `H_(2)O` व `"CO"_(2)` में हो जाता है तथा विलयन का रंग हरा हो जाता है |
`["K"_(2)"Cr"_(2)"O"_(7)+4"H"_(2)"SO"_(4)to "K"_(2)"SO"_(4)+"Cr"_(2)("SO"_(4))_(3)+4"H"_(2)"O"+3("O")]xx2`
`(3("COOH")_(2)+6[O]to6"CO"_(2)+6"H"_(2)"O")/(2"K"_(2)"Cr"_(2)"O"_(7)+8"H"_(2)"SO"_(4)+3"H"_(2)"C"_(2)"O"_(4)to2"K"_(2)"SO"_(4))`
`underset("हरा")(+2"Cr"_(2)("SO"_(4))_(3))+6"CO"_(2)+14"H"_(2)O`

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