question_answer

The bonds present in the structure of dichromate ion are

A)  four equivalent\[Cr-O\]bonds only

B)  si equivalent\[Cr-O\]bonds and one \[O-O\]bond

C)  six equivalent\[Cr-O\]bonds and one \[Cr-Cr\]bond

D)  eight equivalent\[Cr-O\]bonds

E)  six equivalent\[Cr-O\]bonds and one \[Cr-O-Cr\]bond

Correct Answer: E

Solution :

In dichromate ion\[(C{{r}_{2}}O_{7}^{2-})\]two tetrahedral units are shared through an oxygen atom. The two\[CrO\]bonds which share an oxygen atom are longer than other six equivalent \[CrO\]bonds.