Question

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

Answer 1

Answer: (E)

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.