Question

The nature of CrO\(_3\), CrO and Cr\(_2\)O\(_3\) is respectively

• A. acidic, amphoteric, basic
• B. basic, amphoteric, acidic
• C. acidic, basic, amphoteric
• D. amphoteric, basic, acidic

Hint:

Chromium oxides exhibit different acidic or basic properties based on their oxidation states. Higher oxidation states, like in CrO\(_3\), tend to be acidic, while lower ones, like in CrO, are basic. Cr\(_2\)O\(_3\) is amphoteric.

Answer 1

The Correct Option is C

- CrO\(_3\), known as chromic acid, is highly acidic in nature.
- CrO, chromium(II) oxide, is basic in nature.
- Cr\(_2\)O\(_3\), chromium(III) oxide, is amphoteric in nature, meaning it can act as both an acid and a base depending on the environment.
Thus, the correct answer is (3) acidic, basic, amphoteric.