A) \[C{{r}_{2}}{{O}_{3}}\]
B) \[M{{n}_{2}}{{O}_{7}}\]
C) \[{{V}_{2}}{{O}_{3}}\]
D) \[CrO\]
Correct Answer: A
Solution :
If the central metal atom is present in its lowest oxidation state, the oxide is basic, if present in highest oxidation state, the oxide is acidic and if present in intermediate oxidation state the oxide is amphoteric.| Oxide | Oxidation State of central atom | Nature |
| \[C{{r}_{2}}{{O}_{3}}\] | \[+\,3\] | Amphoteric |
| \[M{{n}_{2}}{{O}_{7}}\] | \[+\,7\] | Acidic |
| \[{{V}_{2}}{{O}_{3}}\] | \[+\,3\] | Basic |
| \[CrO\] | \[+\,2\] | Basic |
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