Question
Question: For a metal ion M<sup>3+</sup> the ionic radius = 0.5 Å Therefore the nature of M<sub>2</sub>O<sub>3...
For a metal ion M3+ the ionic radius = 0.5 Å Therefore the nature of M2O3 is-
A
Acidic
B
Alkaline
C
Amphoteric
D
Neutral
Answer
Amphoteric
Explanation
Solution
The ionic potential = 0.53 = 6
φM3+ = 2. 45
Since 2.2 < φM3+ < 3.2 ,
hence M2O3 is an amphoteric oxide.