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  4. The effective atomic number of cobalt in the complex [Co(NH3)6]3+ is

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Q. The effective atomic number of cobalt in the complex $[Co(NH_3)_6]^{3+}$ is

VITEEEVITEEE 2011

Solution:

EAN = at. no. of central atom - oxidation state +2 (number of ligands)
$= 27 -3 + 2(6)$
$= 27 -3 +12 = 36$