Which of the following is a coordination compounds ?

Options

A. Carnallite
B. Microcosmic salt
C. Fischer salt
D. Chrome alum

Answer

C

Explanation

Fischer salt, `K_(3)[Co(NO_(2))_(6)]` is a complex salt of `Co^(3+)` ion. Other are double salts. Double salt is a compound of two salts formed by crystallization form a solution containing bouth of them. For example, potassium sulphate and aluminium sulphate in solution together will crystallize as the double salt `K_(2)SO_(4)` . `(A1)_(2)(SO_(4))_(3)` . `24H_(2)O` . When redissolved the souble salt ionizes two salts. Carnallite is KCI . `MgCI_(2)` . `6H_(2)O` , microcosmic salt is Na `NH_(4)HPO_(4)` . `4H_(2)O` and chrome alum (potassium chromium sulphate) is `K_(2)SO_(4)` . `Cr_(2)(SO_(4))_(3)` . `24H_(2)O` .