MEDIUMMCQ SINGLENEET ChemistryInorganic ChemistryCoordination compoundsWerner’s Theory

Which of the following complex ions obeys Sidgwick‘s effective atomic number (EAN) rule?

A.[Fe(CN)6]3–

B.[Fe(CN)6]4–✓ Correct

C.[Cr(NH3)6]3+

D.[Ni(en)3]2+

Explanation

The Sidgwick‘s effective atomic number (EAN) rule explains that an inert gas configuration is acquired by the central metal atom. According to this rule, a metal atom will accept electrons until the sum of the number of electrons present around the metal becomes equal with the atomic number of the next noble gas. Krypton has atomic number 36. 4 6 3 6 3 3 6 2 3 Fe CN Compound EAN EAN 26 2 12 36 Fe CN 35 Cr NH 33 Ni en 38 Valence Bond Theory

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