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  4. The oxidation number of Co in the complex ion [CoCl (NH3)5]2+ is:

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Q. The oxidation number of $Co$ in the complex ion $[CoCl (NH_{3})_{5}]^{2+}$ is:

Coordination Compounds

Solution:

$[Co Cl (NH_{3})_{5}]^{2+}$
$x + (-1) + 5 (0) = 2$
$x = +3$