Question

In the dichromate dianion

• A. 4Cr - O bonds are equivalent
• B. 6Cr - Obonds are equivalent
• C. All Cr - O bonds are equivalent
• D. All Cr - O bonds are non-equivalent

Answer 1

The correct option is B

6Cr - Obonds are equivalent

Dichromate dianion has following structure

${[O\leftarrow \underset{\stackrel{\downarrow }{O}}{\stackrel{\underset{\uparrow }{O}}{Cr}}-O-\underset{\stackrel{\downarrow }{O}}{\stackrel{\underset{\uparrow }{O}}{Cr}}\to O]}^{2-}$

6, Cr-O bonds are equivalent.