[{Fe}({CN})₆]^{4-} and [{Fe}({H}₂{O})₆]²+} ...

NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

Question : 21 of 43

Marks: +1, -0

[\mathrm{Fe}(\mathrm{CN})_6]^{4-}

and

[\mathrm{Fe}(\mathrm{H}_2\mathrm{O})_6]^{2+}

are of different colours in dilute solutions.Why?

Solution:

[\mathrm{Fe}(\mathrm{CN})_6]^{4-},\mathrm{CN}^-

is a strong field ligand hence, pairing of electronstakes place.

[\mathrm{Fe}(\mathrm{H}_2\mathrm{O})_6]^{4-},\mathrm{H}_2\mathrm{O}

is a weak ligand hence, pairing does not take place

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