Which response given the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [ C o ( N H 3 ) 2 ( H 2 O ) 2 C l 2 ] + ?

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Coordination number of the central is equal the number of sigma bonds formed by the ligands with the central metal atom. Since all the ligands are monoderate (or unidentate), therefore, the coordination number is equal to the number of ligands surrounding the central metal. Here the C.N. = 6.
Let $x =$ O.N. (or oxidation number) of central Co ion.
$x + 1 (0) + 2 (0) + 2 (- 1) = + 1$
or $x = + 3$

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