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  4. The co-ordination number and oxidation number of X in the following compound [X(SO4)(NH3)5]Cl will be:

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Q. The co-ordination number and oxidation number of $X$ in the following compound $[X(SO_4)(NH_3)_5]Cl$ will be:

ManipalManipal 2005Coordination Compounds

Solution:

Co-ordination number is the number of ligands a-bonded to metal-atom. Hence, co-ordination number of $X$ in $[X(SO_4)(NH_3)_5]Cl$ is $6$.
Let oxidation state of $X$ in the complex be $y$, then-
$ y+(-2)+5(0)+(-1)=0 $
$ y-2-1=0 $
$ y=+3 $