STANDARDChemistry-Coordination Compounds
STANDARD Chemistry Bonding in Polyatomic Ions MCQ Question
Type: MCQ-conceptual-Medium-Class 12
In the dichromate anion Cr₂O₇²⁻,
A
all Cr–O bonds are equivalent
B
6Cr–O bonds are equivalent
C
3Cr–O bonds are equivalent
D
no bonds in Cr₂O₇²⁻ are equivalent
Correct Answer
Option B
Detailed Explanation
In the dichromate ion, there are six equivalent Cr–O bonds due to resonance. The structure involves two CrO₄ tetrahedra sharing a corner, leading to equivalent bond lengths for the terminal oxygens.
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