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Chromyl Fluoride, CrO2F2

Chromyl Fluoride, CrO2F2, was obtained by Unverdorben who, on heating a mixture of fluorspar and lead chromate with fuming sulphuric acid, observed the formation of a red gas, originally believed to be a higher fluoride of chromium, namely, CrF6. Dumas, by cooling the gas, obtained it as a liquid. It is a blood-red liquid, decomposed by water, with the formation of chromium trioxide and hydrogen fluoride,

CrO2F2 + H2O = CrO3 + 2HF.

It acts on glass, forming silicon tetrafluoride, and with ammonium chromate, a fluo-chromate is formed.

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