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Question
In the dichromate dianion, the Cr-O-Cr bond angle is ______.
Options
90°
120°
126°
131°
MCQ
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Solution
In the dichromate dianion, the Cr-O-Cr bond angle is 126°.
Explanation:
In the dichromate ion Cr2O72−, two CrO4 tetrahedra share one oxygen atom (a bridging oxygen). The angle formed at this bridging oxygen between the two chromium atoms is called the Cr-O-Cr bond angle. Due to tetrahedral geometry and repulsion between lone pairs and bonding pairs, this angle is approximately 126°.
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