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Why concentrated HNO3 acquires a yellow ...

Why concentrated `HNO_3` acquires a yellow colour on standing in sunlight ?

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### Step-by-Step Solution: 1. **Understanding Concentrated HNO3**: Concentrated nitric acid (HNO3) is a strong oxidizing agent and is typically colorless. However, under certain conditions, it can change color. 2. **Effect of Sunlight**: When concentrated HNO3 is exposed to sunlight, it undergoes a photochemical reaction. The energy from sunlight provides the necessary activation energy for the decomposition of HNO3. 3. **Decomposition Reaction**: The decomposition of concentrated nitric acid can be represented by the following chemical equation: \[ ...
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