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Q.
The number of chlorine to oxygen bonds in $Cl_2O_7$ is
The p-Block Elements - Part2
Solution:
$Cl _{2} O _{7}$ is $O = \underset{\overset{||}{O}}{\overset{\underset{||}{O}}{C}l} - O - \underset{\overset{||}{O}}{\overset{\underset{||}{O}}{C}l}=O$
Hence it has $8$-chlorine to oxygen links.