Phosphorus is kept in

Options

A. Kerosene
B. Alcohol
C. Water
D. Ammonal

Answer

To answer the question "Phosphorus is kept in," we need to analyze the reactivity of phosphorus and the options provided. Here’s a step-by-step solution:

### Step 1: Understand the Reactivity of Phosphorus
Phosphorus is a highly reactive non-metal, particularly when exposed to air. It can ignite spontaneously in air, especially in its white form. Therefore, it must be stored in a way that minimizes its exposure to air.

**Hint:** Consider the properties of phosphorus and how they affect its storage requirements.

### Step 2: Evaluate the Options
We have four options to consider: kerosene, alcohol, water, and ammonia.

1. **Kerosene**: While kerosene is used to store some reactive metals (like sodium), phosphorus is not typically stored in kerosene due to its own reactivity.

**Hint:** Think about whether phosphorus can react with kerosene.

2. **Alcohol**: Similar to kerosene, alcohol is not a suitable medium for storing phosphorus because it can also react with phosphorus.

**Hint:** Consider the chemical nature of alcohol and its potential reactions with phosphorus.

3. **Water**: Water is often used to store phosphorus, particularly to prevent it from reacting with air. It provides a safe environment for phosphorus storage.

**Hint:** Reflect on why water might be a safe option for storing reactive substances.

4. **Ammonia**: Ammonia is a reactive compound and can be explosive in certain conditions. Therefore, phosphorus is not stored in ammonia.

**Hint:** Think about the stability and safety of storing phosphorus in ammonia.

### Step 3: Conclusion
Based on the analysis, the most suitable option for storing phosphorus is **water**. This prevents its reaction with air and keeps it stable.

**Final Answer:** Phosphorus is kept in **water**.