The formula of green solid chromium oxide obtained on heating orange coloured ammonium dichromate is _________ `[CrO_2//Cr_2O_3]`

Explanation

To determine the formula of the green solid chromium oxide obtained on heating orange-colored ammonium dichromate, we can follow these steps:

### Step 1: Identify the compound
The compound in question is ammonium dichromate, which has the chemical formula \( \text{(NH}_4)_2\text{Cr}_2\text{O}_7 \).

**Hint:** Recognize the chemical formula of ammonium dichromate and its components.

### Step 2: Understand the heating process
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