What is fuming nitric acid ? What colour is it ?

Explanation

### Step-by-Step Solution:

1. **Definition of Fuming Nitric Acid**:
- Fuming nitric acid is a concentrated form of nitric acid (HNO3) that contains dissolved nitrogen oxides. It is characterized by the presence of these nitrogen oxides, which can include NO, NO2, N2O3, or N2O5. The presence of these oxides gives the acid its fuming property.

2. **Composition**:
- Fuming nitric acid is essentially a mixture of nitric acid and nitrogen oxides. The nitrogen oxides contribute to the fuming nature of the acid, which is why it is referred to as "fuming" nitric acid.

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