The crystals of ferrous sulphate on heating give

Options

A. `FeO +SO_2 +H_2O`
B. `Fe_2O_3 +H_2SO_4+H_2O`
C. `Fe_2O_3+SO_2+SO_3`
D. `FeO +SO_3 +H_2SO_4 + H_2O`

Answer

To solve the question regarding the products formed when ferrous sulphate crystals are heated, we can follow these steps:

### Step 1: Identify the Composition of Ferrous Sulphate
Ferrous sulphate is represented by the chemical formula FeSO4. It commonly exists as ferrous sulphate heptahydrate, which means it contains 7 molecules of water (7H2O) associated with each formula unit of FeSO4.

### Step 2: Heating Ferrous Sulphate
When ferrous sulphate heptahydrate (FeSO4·7H2O) is heated, it undergoes a dehydration process. The water molecules are released as steam, resulting in the formation of anhydrous ferrous sulphate (FeSO4).

**Reaction:**
\[ \text{FeSO}_4 \cdot 7\text{H}_2\text{O} \xrightarrow{\text{heat}} \text{FeSO}_4 + 7\text{H}_2\text{O} \]

### Step 3: Further Heating of Anhydrous Ferrous Sulphate
Upon further heating of anhydrous ferrous sulphate, it decomposes to form ferric oxide (Fe2O3), sulfur dioxide (SO2), and sulfur trioxide (SO3).

**Reaction:**
\[ 4\text{FeSO}_4 \xrightarrow{\text{heat}} 2\text{Fe}_2\text{O}_3 + 4\text{SO}_2 + \text{SO}_3 \]

### Step 4: Summary of Products
The final products of heating ferrous sulphate crystals are:
1. Ferric oxide (Fe2O3)
2. Sulfur dioxide (SO2)
3. Sulfur trioxide (SO3)

### Conclusion
Therefore, the correct answer to the question is that the crystals of ferrous sulphate on heating give ferric oxide along with sulfur dioxide and sulfur trioxide.

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