Which of the following is incorrect about graphite ?

Options

A. For electrodes in batteries
B. Crucibles made from graphite are used for its inertness to dilute acids and alkalies
C. For adsorbing poisonous gases
D. Lubricant at high temperature.

Answer

To determine which statement about graphite is incorrect, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Evaluate Option 1: "It is used for electrodes in battery."**
- Graphite is known for its excellent electrical conductivity due to the presence of delocalized electrons that can move freely between the layers of its structure. This property makes graphite suitable for use as electrodes in batteries.
- **Conclusion**: This statement is correct.

2. **Evaluate Option 2: "Crucibles made from graphite are used for its inertness to dilute acids and alkalis."**
- Graphite is chemically inert and does not react with most acids and alkalis, making it an ideal material for crucibles that can withstand high temperatures without reacting with the substances contained within.
- **Conclusion**: This statement is also correct.

3. **Evaluate Option 3: "It is used for absorbing poisonous gases."**
- This statement is incorrect. Graphite does not have the capacity to absorb poisonous gases effectively. Instead, activated charcoal is commonly used for this purpose due to its high surface area and adsorption properties.
- **Conclusion**: This statement is incorrect.

4. **Evaluate Option 4: "Lubricant at high temperature."**
- Graphite is used as a lubricant because its layers can slide over each other easily due to weak van der Waals forces. This property remains effective even at high temperatures, making it a suitable lubricant in various applications.
- **Conclusion**: This statement is correct.

### Final Answer:
The incorrect statement about graphite is **Option 3: "It is used for absorbing poisonous gases."**