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  4. The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is . Given 6

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Q. The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ____________.
Given 6

JEE MainJEE Main 2020The d-and f-Block Elements

Solution:

Total number of bonds between chromium and oxygen in both structures are 18.
Note :- But answer of NTA is 12. They consider only linkages between Chromium and Oxygen but in question total no. of bonds are asked so $\sigma$ and $\pi$ bonds must be considered separately.

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