Number of identical Cr-O bonds in dichromate | vedclass

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Question

(B) The dichromate ion $(Cr_2O_7^{2-})$ consists of two $CrO_4$ tetrahedra sharing one oxygen atom at the corner.In this structure,there are two types

Vedclass · Accepted Answer

$6$

Vedclass · Answer

(B) The dichromate ion $(Cr_2O_7^{2-})$ consists of two $CrO_4$ tetrahedra sharing one oxygen atom at the corner.In this structure,there are two types of $Cr-O$ bonds:$1$. The bridging $Cr-O-Cr$ bond,which involves two $Cr-O$ bonds that are not equivalent to the terminal ones.$2$. The terminal $Cr-O$ bonds,which are $6$ in total.Due to resonance,all $6$ terminal $Cr-O$ bonds are identical in length and strength.Therefore,the number of identical $Cr-O$ bonds is $6$. Hence,option $B$ is the correct answer.

Number of identical $Cr-O$ bonds in dichromate ion $Cr_2O_7^{2-}$ is

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