Question

Oxidation number of Cr2O2 2-

Answer 1

Answer:

2x-4=-2 so x=+1 where x=oxidation no of Cr

Explanation:

Answer 2

The oxidation number of Chromium in $Cr_2O_2^{2-}$ is +4

Explanation:

Oxidation number is defined as the number which is assigned to the element when it gains or loose electrons. If the element gains electron, it will attain a negative oxidation state and if the element looses electrons, it will attain a positive oxidation state.

We are given a chemical compound having formula of $Cr_2O_2^{2-}$

We take the oxidation state of chromium atom be 'x'.

Oxidation state of oxygen atom = -2

Evaluating the oxidation state of chlorine atom:

$x+2(-2)=-2\\\\x=+4$

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