Effective atomic number (EAN) of Fe in brown ring complex [Fe(H_2O)_5NO]^ 2+

JEE Advanced Chemistry question

Effective atomic number (EAN) of Fe in brown ring complex

(A)36
(B)37Correct
(C)38
(D)39

Answer: (B)

Solution

In the brown-ring complex, NO is bonded as the nitrosyl cation (it donates its odd electron to the metal: ), so the iron centre is formally (25 electrons, since

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Question ID VK-159648