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

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

NTA AbhyasNTA Abhyas 2020The d-and f-Block Elements

Solution:

In chromate $CrO_{4}^{2 -}$ and dichromate $Cr_{2}O_{7}^{2 -}$ there are 4 and 8 $Cr-O$ bonds are there as follows

Solution

Total number of Cr-O bond = 12.