Why does a paper soaked in `K_(2)Cr_(2)O_(7)` solution turn green in the detection of `SO_(3)^(2-)` ion?

Explanation

To understand why a paper soaked in potassium dichromate (K₂Cr₂O₇) solution turns green when detecting sulfite ions (SO₃²⁻), we can break down the process into several steps:

### Step-by-Step Solution:

1. **Understanding Potassium Dichromate**:
- Potassium dichromate (K₂Cr₂O₇) is a strong oxidizing agent and is typically orange in color due to the presence of chromium in the +6 oxidation state.

2. **Introduction of Sulfite Ions**:
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