`[Ni(CN)_(4)]^(2-)` complex has the shape …… and is ….. In terms of magnetic nature whereas `[NiCl_(4)]`^(2-)` has the shape …… and is ….. .

Explanation

To solve the question regarding the shapes and magnetic nature of the complexes `[Ni(CN)₄]²⁻` and `[NiCl₄]²⁻`, we will follow these steps:

### Step 1: Determine the oxidation state of Ni in both complexes.
- For `[Ni(CN)₄]²⁻`: Let the oxidation state of Ni be \( x \). Since CN is a -1 ligand and there are 4 CN ligands, we have:
\[ x + 4(-1) = -2 \implies x - 4 = -2 \implies x = +2 \]
- For `[NiCl₄]²⁻`: Similarly, let the oxidation state of Ni be \( y \). Since Cl is also a -1 ligand and there are 4 Cl ligands, we have:
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