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पोटेशियम डाइक्रोमेट के अम्लीय विलयन में `"SO"_(2)` प्रवाहित की जाती है |

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पोटेशियम डाइक्रोमेट के अम्लीय विलयन में `"SO"_(2)` प्रवाहित की जाती है |
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`"SO"_(2)`, सल्फ्यूरिक अम्ल में ऑक्सीकृत हो जाती है तथा विलयन का रंग हरा हो जाता है |
`"K"_(2)"Cr"_(2)"O"_(7)+3"SO"_(2)+"H"_(2)"SO"_(4)to "K"_(2)" SO"_(4)+ underset("क्रोमिक सल्फेट")("Cr"_(2)("SO"_(4))_(3)+"H"_(2)"O")`
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