Identify the oxoanion of chromium which is stable in acidic medium

Explanation

To identify the oxoanion of chromium that is stable in acidic medium, we can follow these steps:

### Step 1: Understand the types of chromium oxoanions
Chromium can form several oxoanions, primarily:
- Dichromate ion (Cr₂O₇²⁻)
- Chromate ion (CrO₄²⁻)

### Step 2: Determine the stability of these oxoanions in different media
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