Question

oxidation number of Cr in K3CrO8 is​

Answer 1

K (potassium) is an alkali metal so it has +1 oxidation number in pretty much all its compounds. O (oxygen) typically has -2 oxidation number (but see below). The overall compound is neutral. Therefore we have 3 * (+1) + x + 8 * (-2) = 0, and some algebra gives us x = oxidation number of Cr = +13.

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Answer 2

↪️ Oxidation State↩️

Potassium is alkali metal so mostly it has oxidation state of +1.

Here oxigen has oxidation state of -2.

And overall charge on compound is 0 (neutral).

Now , let oxidation number of Cr be X.

so ,

=> 3 × 1 + X + 8 × -3 = 0

X = +13

Hence , Oxidation number of Cr in compound K3CrO8 is +13.