Question

oxidation number of cr in cro3​

Answer 1

Answer:

+6

Chromium trioxide is a chromium oxide composed of a single chromium bound (oxidation state +6) to three oxygens; the acidic anhydride of chromic acid.

Explanation:

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Answer 2

Answer:

let oxidation number of cr be x

oxidation number of o is -2

so x+2(-2)=0

x=4

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