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  4. Dichromate ion is treated with base, the oxidation number of Cr in the product formed is .

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Q. Dichromate ion is treated with base, the oxidation number of $Cr$ in the product formed is ____.

JEE MainJEE Main 2021The d-and f-Block Elements

Solution:

$Cr _{2} O _{7}^{2-}+ OH ^{-} \longrightarrow CrO _{4}^{2-}$

Oxidation state of $Cr$ in $CrO _{4}^{2-}$ is +6