Correct the following statements by changing the under lined part of the sentence (Do not change the whole sentence)
`[CO(NH_3)_6][Cr(CN)_6] and [Cr(NH_3)_6][CO(CN)_6]` are linkage isomers.

Explanation

To correct the given statement, we need to identify the type of isomers represented by the compounds `[CO(NH_3)_6][Cr(CN)_6]` and `[Cr(NH_3)_6][CO(CN)_6]`.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are `[CO(NH_3)_6][Cr(CN)_6]` and `[Cr(NH_3)_6][CO(CN)_6]`. Here, we have two different metal centers: cobalt (Co) and chromium (Cr), with different ligands attached to them.

2. **Understand Linkage Isomers**: Linkage isomers occur when a ligand can coordinate to the metal in more than one way. For example, the nitrite ion (NO₂⁻) can bind through nitrogen or oxygen, leading to different isomers.

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