Write the state of hybridization, the shape and the magnetic behaviour of the following complex entities:
(i) `[Cr(NH_(3))_(4) Cl_(2)]Cl`
(ii) `[Co Fe_(6)]^(3-)`
(iii) `K_(2)[Ni(CH)_(4)]`

Explanation

To solve the question regarding the state of hybridization, shape, and magnetic behavior of the given complex entities, we will analyze each complex step by step.

### (i) For the complex `[Cr(NH₃)₄Cl₂]Cl`:

1. **Determine the oxidation state of Chromium (Cr)**:
- Let the oxidation state of Cr be \( x \).
- The charge contributed by 4 NH₃ (neutral) is \( 0 \).
- The charge contributed by 2 Cl (each -1) is \( -2 \).
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