In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:
(a) `Na_(4)[Fe(CN)_(6)]` (b) `Fe_(4)[Fe(CN)_(6)]_(3)` (c) `Fe_(2)[Fe(CN)_(6)]` (d) `Fe_(3)[Fe(CN)_(6)]_(4)`

Explanation

To solve the question regarding the Lassaigne's test for nitrogen in an organic compound and the formation of the Prussian blue color, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lassaigne's Test**:
- Lassaigne's test is a qualitative analysis method used to detect the presence of nitrogen in organic compounds. It involves converting the organic compound into sodium cyanide (NaCN) by heating it with sodium metal and carbon.

2. **Formation of Sodium Cyanide**:
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