Fill in the blanks by choosing the appropriate word/words from those given in the brackets: (double salts, complex compounds, uni, bi, six, four, three, coordination, linkage, imperfect, perfect, normal, penetrating, central ion, chelating, Werner, Pauling)
`[Cr(NH_3)_6][Co(CN)_6]` exhibits ..............isomerism.

Explanation

To solve the question regarding the type of isomerism exhibited by the compound \([Cr(NH_3)_6][Co(CN)_6]\), we will follow these steps:

### Step 1: Identify the Components of the Compound
The compound consists of two parts: a cationic complex \([Cr(NH_3)_6]^{3+}\) and an anionic complex \([Co(CN)_6]^{3-}\).

### Step 2: Understand Coordination Isomerism
Coordination isomerism occurs when there is an interchange of ligands between cationic and anionic entities of different metal ions in a complex. This means that the ligands can switch places between the two metal centers.

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