In chemical reaction of potassium ferrocyanide and hydrogen peroxide in the presence of dil.`H_2SO_4`

Options

A. Ferrocyanide gets reduced to ferricyanide
B. Ferrocyanide gets oxidised
C. Iron does not change its oxidation state
D. Hydrogen peroxide is oxidised

Answer

To solve the problem regarding the chemical reaction of potassium ferrocyanide and hydrogen peroxide in the presence of dilute sulfuric acid (H₂SO₄), we will follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are:
- Potassium ferrocyanide (K₄[Fe(CN)₆])
- Hydrogen peroxide (H₂O₂)
- Dilute sulfuric acid (H₂SO₄)

### Step 2: Write the Reaction
When potassium ferrocyanide reacts with hydrogen peroxide in the presence of dilute sulfuric acid, the products formed are:
- Ferricyanide (K₃[Fe(CN)₆])
- Potassium sulfate (K₂SO₄)
- Water (H₂O)

The balanced reaction can be represented as:
\[ K_4[Fe(CN)_6] + H_2O_2 + H_2SO_4 \rightarrow K_3[Fe(CN)_6] + K_2SO_4 + H_2O \]

### Step 3: Determine Oxidation States
1. **For Potassium Ferrocyanide (K₄[Fe(CN)₆])**:
- Potassium (K) has an oxidation state of +1.
- The complex ion [Fe(CN)₆] has a charge of -4 (as the overall charge of K₄[Fe(CN)₆] is neutral).
- To find the oxidation state of iron (Fe), let it be x:
\[ x + 6(-1) = -4 \]
\[ x - 6 = -4 \]
\[ x = +2 \]

2. **For Ferricyanide (K₃[Fe(CN)₆])**:
- Potassium (K) has an oxidation state of +1.
- The complex ion [Fe(CN)₆] has a charge of -3.
- Again, let the oxidation state of iron (Fe) be x:
\[ x + 6(-1) = -3 \]
\[ x - 6 = -3 \]
\[ x = +3 \]

### Step 4: Analyze the Changes in Oxidation States
- The oxidation state of iron changes from +2 in ferrocyanide to +3 in ferricyanide, indicating that ferrocyanide is oxidized.
- The hydrogen peroxide (H₂O₂) is reduced to water (H₂O), as it loses oxygen.

### Step 5: Conclusion
Based on the analysis:
- Ferrocyanide (K₄[Fe(CN)₆]) is oxidized to ferricyanide (K₃[Fe(CN)₆]).
- Hydrogen peroxide (H₂O₂) is reduced to water (H₂O).

### Final Answer
The correct statement regarding the reaction is:
- **Ferrocyanide gets oxidized to ferricyanide**.