How you know that how many peroxide O in K3CrO8
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The question seems to be incomplete. So, I am giving an assumed answer.
The number of peroxide bonds in K₃CrO₈ is - 4 linkages.
The number of peroxy linkages in a compound can be calculated by using the formula = (Theoretical Oxidation number) - (Maximum Oxidation number) / 2.
But for the theoretical O.S of Cr⁻ in K₂CrO₈ will be = 16 - 3 = 13
The maximum number of linkages in the structure [CrO₈]⁻³ are = 5
Therefore, the number of peroxy linkages according to the formula can be calculated as = (13 - 5)/2 = 4
Therefore, the number of peroxide bonds in K₂CrO₈ is = 4
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