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  4. The coordination numbers of Co and Al in [Co(Cl)(en)2]Cl and K3[Al(C2O4)3], respectively, are: (en=ethane-1,2-diamine)

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Q. The coordination numbers of Co and Al in $ [Co(Cl)(en)_2]Cl$ and $K_3[Al(C_2O_4)_3]$, respectively, are :
(en=ethane-1,2-diamine)

JEE MainJEE Main 2019Coordination Compounds

Solution:

en and $C_2O_4^{2-}$ are bidentate ligand. So coordination number of $[Co(Cl)(en)_2]Cl$ is $5$ and $K_3[Al(C_2O_4)_3]$ is $6$.