Give reasons for following in one or two sentences:
`CrO_3` is an acid anhydride?

Explanation

To determine why \( \text{CrO}_3 \) is classified as an acid anhydride, we can follow these steps:

### Step 1: Define Acid Anhydride
An acid anhydride is a compound that is formed when water is removed from an acid. It can react with water to regenerate the corresponding acid.

### Step 2: Identify the Corresponding Acid
In the case of \( \text{CrO}_3 \), it is related to chromic acid \( \text{H}_2\text{CrO}_4 \).

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