When `SCN^(-)` is added to an aqueous solution containing `Fe(NO_(3))_(3)`, the complex ion produced is

Options

A. `[Fe(OH_(2))_(2)(SCN)]^(2+)`
B. `[Fe(OH_(2))_(5)(SCN)]^(2+)`
C. `[Fe(OH_(2))_(8)(SCN)]^(2+)`
D. `Fe(OH_(2))(SCN)]^(6+)`

Explanation

To solve the question of what complex ion is produced when SCN⁻ is added to an aqueous solution containing Fe(NO₃)₃, we can follow these steps:

### Step 1: Identify the reactants
The reactants in this scenario are:
- SCN⁻ (thiocyanate ion)
- Fe(NO₃)₃ (iron(III) nitrate)

### Step 2: Understand the chemistry involved
When SCN⁻ is added to a solution of Fe(NO₃)₃, the thiocyanate ion can coordinate with the iron ion (Fe³⁺) to form a complex. Iron(III) ions are known to form complexes with thiocyanate ions.

### Step 3: Write the reaction
The reaction can be represented as:
\[ \text{Fe}^{3+} + \text{SCN}^- \rightarrow \text{[Fe(SCN)]}^{2+} \]

### Step 4: Identify the complex ion
The complex ion formed is [Fe(SCN)]²⁺. This complex is often referred to as iron(III) thiocyanate.

### Step 5: Consider the presence of other ions
In the solution, there are also nitrate ions (NO₃⁻) present from the dissociation of Fe(NO₃)₃. However, they do not participate in the formation of the complex and remain as spectator ions.

### Step 6: Write the final expression for the complex
The overall reaction can be summarized as:
\[ \text{Fe(NO}_3\text{)}_3 + \text{SCN}^- \rightarrow \text{[Fe(SCN)]}^{2+} + \text{NO}_3^- \]

### Conclusion
The complex ion produced when SCN⁻ is added to an aqueous solution containing Fe(NO₃)₃ is [Fe(SCN)]²⁺.

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