How many peroxide linkages are present in a compound of chromium with oxygen which is blue in colour and soluble in amyl alcohol, produced by treating K?CrO? with acidified H?O??

${\mathrm{C}\mathrm{r}\mathrm{O}}_4^{2-}+2{\mathrm{H}}^{+}+2{\mathrm{H}}_2{\mathrm{O}}_2?\underset{\text{Chromium Pentoxide}}{{\mathrm{C}\mathrm{r}\mathrm{O}}_5+3{\mathrm{H}}_2\mathrm{O}}$

 

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