Question

Pick out the complex compound in which the central metal atom obeys EAN rule strictly
(a) K₄[Fe(CN)₆]
(b) K₃[Fe(CN)₆]
(c) [Cr(H₂O)₆]Cl₃
(d) [Cu(NH₃)₄]SO₄

Answer 1

(a) K₄[Fe(CN)₆] this is the answer

Answer 2

Answer:(a) K₄[Fe(CN)₆] is the correct answer.

Explanation:

EAN is the acronym for effective atomic number.

It is the sum total of electrons around the central metal ion present in any complex compound.

It is the sum of electrons on metal ions and number of electrons which are donated by the ligands.

Ligands are ions which are coordinated to the metal ion.

They are the donor groups.

They can be positive, negative OR neutral.

EAN formula is:

EAN=Z-X+Y

Z IS ATOMIC NUMBER OF METAL.

X IS NUMBER OF ELECTRONS LOST DURING FORMATION OF METAL ION FROM ITS ATOM

Y IS NUMBER OF ELECTRONS DONATED BY LIGANDS.

Here, only (a) K₄[Fe(CN)₆] follows the correct EAN rule.

Hence, (a) K₄[Fe(CN)₆] is the correct answer