Write the name, stereochemistry and magnetic behaviour of the following :
(At.nos. Mn = 25, Co = 27 , Ni = 28)
(i) `K_4[Mn(CN)_6]`
(ii) `[Co(NH_3)_5Cl]Cl_2`
(iii) `k_2[Ni(CN)_4]`

Explanation

To solve the question, we will analyze each complex compound step by step, determining their IUPAC names, stereochemistry, and magnetic behavior.

### (i) \( K_4[Mn(CN)_6] \)

**Step 1: IUPAC Name**
- The cationic part is potassium (K).
- The coordination sphere contains six cyanide ligands (CN), which is a strong field ligand.
- The central metal is manganese (Mn) with a charge of +2 (since the overall charge of the complex is -4 from K and -6 from CN).
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