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The deep blue colour obtained on adding ...

The deep blue colour obtained on adding K4FeCN6, to ferrous sulphate is due to the formation of

A

`Fe[Fe(CN)_(6)]`

B

`Fe[Fe(CN)_(6)l]_2`

C

`Fe_3 [Fe(CN)_(6)]_(4)`

D

`Fe_4 [Fe(CN)_6]_3`

Text Solution

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The correct Answer is:
To solve the question about the deep blue color obtained from the reaction between potassium ferrocyanide (K4[Fe(CN)6]) and ferrous sulfate (FeSO4), we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Reactants**: - The two reactants in this case are ferrous sulfate (FeSO4) and potassium ferrocyanide (K4[Fe(CN)6]). 2. **Write the Chemical Reaction**: - When these two react, they form a complex. The balanced equation for the reaction can be written as: \[ 3 \text{FeSO}_4 + 2 \text{K}_4[\text{Fe(CN)}_6] \rightarrow \text{Fe}_3[\text{Fe(CN)}_6]_2 + 3 \text{K}_2\text{SO}_4 \] - Here, the product formed is a complex known as ferric ferrocyanide or Prussian blue. 3. **Identify the Product Responsible for the Color**: - The product that gives the deep blue color is the complex formed, which is ferric ferrocyanide (Fe3[Fe(CN)6]2). 4. **Conclusion**: - The deep blue color observed is due to the formation of ferric ferrocyanide, commonly known as Prussian blue. ### Final Answer: The deep blue color obtained on adding K4[Fe(CN)6] to ferrous sulfate is due to the formation of **ferric ferrocyanide (Fe3[Fe(CN)6]2)**. ---
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