Which of the following is the odd one out ?

Potassium ferrocyanide

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Tetraamminezinc(II) chloride

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Ferrous ammonium sulphate

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Potassium ferricyanide

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Solution

The correct option is C Ferrous ammonium sulphate
Ferrous ammonium sulphate is a double salt with two different cations.
Double salts are different from coordination compound. Compounds (a), (b) and (d) others are coordination compounds, whereas ferrous ammonium sulphate is not a coordination compound and it ionizes into ferrous, Ammonium and sulphate ions.
Hence, option (c) is correct.

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