Question

\[\ce{Cr2O^{2-}_7}\] ions possess ______ equivalent Cr-O bonds.

Answer 1

\[\ce{Cr2O^{2-}_7}\] ions possess 6 equivalent Cr-O bonds.

Explanation:

In the \[\ce{Cr2O^{2-}_7}\] ion, each chromium atom is in the +6 oxidation state and forms bonds with oxygen atoms in a tetrahedral coordination. Due to resonance, six Cr-O bonds (excluding the Cr-O-Cr bridge) become equivalent in length and strength.