Write the state of hybridisation, the shape and the magnetic behaviour of the following complexes.
(i) `[Cr(NH_(3))_(4)Cl_(2)]Cl`
(ii) `[Co(en)_(3)]Cl_(3)`
(iii) `K_(2)[Ni(CN)_(4)]`

Explanation

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

### (i) Complex: `[Cr(NH₃)₄Cl₂]Cl`

**Step 1: Determine the oxidation state of Chromium (Cr).**
- Let the oxidation state of Cr be \( x \).
- The ligands NH₃ are neutral (0 charge), and Cl has a charge of -1.
- The overall charge of the complex is 0.
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