The IUPAC name of the complex `K_(2)[Ni (CN)_(4)]` is

Options

A. Tetrapotassiumtetracyanonickelate (0)
B. Potassiumtetracyanonickel (0)
C. Potassium tetracyanonickelate (II)
D. Tetrapotassiumtetracyanonickel (0)

Answer

To determine the IUPAC name of the complex \( K_2[Ni(CN)_4] \), we can follow these steps:

### Step 1: Identify the components of the complex
The complex consists of:
- A cation: \( K^+ \) (potassium)
- An anionic complex: \( [Ni(CN)_4]^{2-} \)

### Step 2: Name the cation
The cation is potassium, and since there are two potassium ions, we simply refer to it as "potassium".

### Step 3: Name the ligands
In the complex \( [Ni(CN)_4]^{2-} \), the ligand is cyanide (CN). When there are multiple ligands, we use prefixes to indicate the number of ligands. The prefix for four is "tetra". Therefore, the ligand is named "tetracyano".

### Step 4: Name the metal
The metal in the complex is nickel (Ni). Since the complex ion has a negative charge, we modify the name of the metal to reflect this. Nickel in this case is in the oxidation state of +2, so we name it as "nickelate".

### Step 5: Combine the names
Now we combine the names of the cation and the anionic complex. The full name of the complex is:
- Cation: potassium
- Anionic complex: tetracyanonickelate

Putting it all together, the IUPAC name of the complex \( K_2[Ni(CN)_4] \) is:
**Potassium tetracyanonickelate(II)**.

### Final Answer:
**Potassium tetracyanonickelate(II)**

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