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JEE • Chemistry

Coordination Compounds

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Addition Compounds and Coordination Identity

The source classifies addition compounds into double salts and coordination compounds.

Fe(CN)2+4KCN→Fe(CN)2⋅4KCNFe(CN)_2+4KCN\rightarrow Fe(CN)_2\cdot 4KCN
K4[Fe(CN)6](aq.)⇌4K+(aq.)+[Fe(CN)6]4−(aq.)K_4[Fe(CN)_6](aq.)\rightleftharpoons 4K^+(aq.)+[Fe(CN)_6]^{4-}(aq.)
TypeSource-backed identity in solution

Double salt

Loses identity in solution.

Coordination compound

Retains identity in solution.

Coordination compound example

K4[Fe(CN)6]K_4[Fe(CN)_6] gives [Fe(CN)6]4−[Fe(CN)_6]^{4-} in aqueous solution.