Nitrogen gas is absorbed by

Options

A. Calcium hydroxide
B. Ferrous sulphate
C. Calcium carbide
D. Aluminium carbide

Answer

**Step-by-Step Solution:**

1. **Understanding Absorption of Nitrogen Gas:**
- Nitrogen gas (N₂) is a diatomic molecule that is relatively inert under standard conditions. To find a suitable absorbent for nitrogen gas, we need to consider substances that can interact with nitrogen without undergoing a significant chemical reaction.

2. **Evaluating the First Option - Calcium Hydroxide (Ca(OH)₂):**
- Calcium hydroxide is known to absorb gases like nitrogen oxides (NO and NO₂) but is not effective for nitrogen gas itself. It primarily reacts with acidic gases and does not absorb nitrogen gas.

3. **Evaluating the Second Option - Ferrous Sulphate (FeSO₄):**
- Ferrous sulphate can react with nitrogen, leading to the formation of ferric sulphate (Fe₂(SO₄)₃). This indicates that it does not simply absorb nitrogen but rather reacts with it, making it unsuitable as an absorbent for nitrogen gas.

4. **Evaluating the Third Option - Calcium Carbide (CaC₂):**
- Calcium carbide is known to absorb nitrogen gas, especially at high temperatures. It can form calcium cyanamide (CaCN₂) when it interacts with nitrogen. This property makes calcium carbide a suitable absorbent for nitrogen gas.

5. **Conclusion:**
- Based on the evaluations, the most appropriate absorbent for nitrogen gas among the given options is **Calcium Carbide (CaC₂)**.

**Final Answer: Calcium Carbide (CaC₂) is used to absorb nitrogen gas.**

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