Which of the following sompound is obtained on heating potassium ferrocyanide with concentrated `H_(2)SO_(4)`?

Options

A. `CO_(2)`
B. `CO`
C. `C_(2)H_(2)`
D. `(CN)_(2)`

Explanation

To determine which compound is obtained by heating potassium ferrocyanide with concentrated sulfuric acid (H₂SO₄), we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are potassium ferrocyanide (K₄[Fe(CN)₆]) and concentrated sulfuric acid (H₂SO₄).

### Step 2: Understand the Reaction
When potassium ferrocyanide is heated with concentrated H₂SO₄, it undergoes a decomposition reaction. The concentrated sulfuric acid acts as a dehydrating agent.

### Step 3: Write the Reaction
The reaction can be represented as follows:
\[ K_4[Fe(CN)_6] + H_2SO_4 \rightarrow \text{Products} \]

### Step 4: Identify the Products
The products formed from the reaction of potassium ferrocyanide with concentrated sulfuric acid include:
- Potassium hydrogen sulfate (KHSO₄)
- Iron(II) sulfate (FeSO₄)
- Carbon monoxide (CO)
- Water (H₂O)
- Ammonium sulfate ((NH₄)₂SO₄)

### Step 5: Balance the Reaction
To balance the reaction, we can write:
\[ K_4[Fe(CN)_6] + 6 H_2SO_4 \rightarrow 4 KHSO_4 + FeSO_4 + 6 CO + 3 (NH_4)_2SO_4 + 6 H_2O \]

### Step 6: Identify the Main Product
From the balanced equation, we can see that one of the products is carbon monoxide (CO).

### Conclusion
Thus, the compound obtained on heating potassium ferrocyanide with concentrated H₂SO₄ is carbon monoxide (CO).

### Final Answer
The correct option is **B. Carbon monoxide (CO)**.

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