Picric acid is (at `25^(@)` C)

Options

A. A white solid
B. A colourless liquid
C. A gas
D. A bright yellow solid

Answer

To answer the question about picric acid at 25°C, we will go through the following steps:

### Step 1: Identify the Chemical Structure
Picric acid, also known as 2,4,6-trinitrophenol, has a specific chemical structure. It consists of a phenolic ring with three nitro groups (NO2) and one hydroxyl group (OH) attached to it. The structure can be represented as follows:

- **Chemical Formula**: C6H3N3O7

### Step 2: Recognize the Common Names
Picric acid is commonly referred to as:
- Tri-nitro-phenol (TNP)
- 2-hydroxy-1,3,5-trinitrobenzene

### Step 3: Describe Physical Properties
At 25°C, the physical properties of picric acid include:
- **Appearance**: It is a colorless to yellow solid.
- **Solubility**: It is soluble in water, alcohol, and ether.

### Step 4: Note the Explosive Nature
Picric acid is known for its explosive properties, especially when dry. This is an important safety consideration when handling it.

### Step 5: Summary of Key Points
- Picric acid is a tri-nitro-phenol compound.
- It appears as a colorless to yellow solid at room temperature.
- It is soluble in various solvents and has explosive characteristics.

### Final Answer
Picric acid at 25°C is a colorless to yellow solid, known as 2,4,6-trinitrophenol, with the chemical formula C6H3N3O7, and is recognized for its explosive properties.

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