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The effective atomic number of cobalt in [Co(NH3)5H2O]3+ is

(a) 36

(b) 33

(c) 24

(d) 30

1 Answer

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Best answer

Answer is : (a) 36

EAN = (atomic number - oxidation state + 2 x CN)

= 27 - 3 + 2 x 6

= 24 + 12 = 36

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