On heating ferrous sulphate crystals, one would get

Options

A. sweet smell
B. sweet smell
C. irritating chocking smell
D. fruity smell.

Explanation

To solve the question of what happens when ferrous sulphate crystals are heated, we can follow these steps:

### Step 1: Understand the Composition of Ferrous Sulphate
Ferrous sulphate (FeSO₄) is a chemical compound that contains iron, sulfur, and oxygen. It is often found in its crystalline form.

**Hint:** Remember that ferrous sulphate is composed of iron (Fe), sulfur (S), and oxygen (O).

### Step 2: Heating Ferrous Sulphate
When ferrous sulphate crystals are heated, they undergo thermal decomposition. This means that the heat causes the compound to break down into simpler substances.

**Hint:** Think about what happens to many compounds when they are heated – they often break down into their components.

### Step 3: Identify the Products of Decomposition
Upon heating, ferrous sulphate decomposes to form:
- Ferric oxide (Fe₂O₃), which is a reddish-brown solid.
- Sulfur dioxide (SO₂), which is a colorless gas with a choking smell.
- Sulfur trioxide (SO₃), which is also a colorless gas.

**Hint:** Consider the colors and smells of the gases produced during the reaction.

### Step 4: Analyze the Smells of the Gases
Among the products, sulfur dioxide is known for its irritating and choking smell. This is a key characteristic of the gas produced during the heating of ferrous sulphate.

**Hint:** Recall that certain gases have distinct smells that can be irritating or suffocating.

### Step 5: Conclusion
Based on the decomposition of ferrous sulphate upon heating, the correct answer to the question is that one would get an irritating choking smell due to the release of sulfur dioxide.

**Final Answer:** The correct option is C: irritating choking smell.