Dinitrogen

Options

A. is a colourless, odourless, tasteless and non-toxic gas
B. has a very low solubility in water
C. is rather inert at room temperature
D. All of the above

Answer

To solve the question regarding the properties of dinitrogen (N₂), we will analyze each property mentioned in the question step by step.

### Step-by-Step Solution:

1. **Understanding Dinitrogen (N₂)**:
- Dinitrogen, commonly known as nitrogen gas, is represented by the chemical formula N₂. It consists of two nitrogen atoms bonded together by a triple bond.

2. **Colorless**:
- Dinitrogen is indeed colorless. In its gaseous state, it does not have any color, which is a characteristic of many gases.

3. **Odorless**:
- Dinitrogen is odorless. It does not emit any smell, making it undetectable by human senses in its gaseous form.

4. **Tasteless**:
- Dinitrogen is tasteless. Like many gases, it does not have a taste, which means it cannot be perceived through the sense of taste.

5. **Non-toxic**:
- Dinitrogen is considered non-toxic. It is a major component of the Earth's atmosphere and is not harmful to humans or animals in normal concentrations.

6. **Low Solubility in Water**:
- Dinitrogen has very low solubility in water. This means that only a small amount of nitrogen gas can dissolve in water, which is a characteristic of non-polar gases.

7. **Inert at Room Temperature**:
- Dinitrogen is relatively inert at room temperature due to the strong triple bond between the nitrogen atoms. This high bond dissociation energy makes it less reactive under normal conditions.

### Conclusion:
Based on the analysis of the properties of dinitrogen, we can conclude that all the statements provided in the question are correct. Therefore, the answer is:

**Option 4: All of the above.**