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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 = 30.5\frac{3}{0.5} = 6

φM3+\sqrt{\varphi_{M^{3 +}}} = 2. 45

Since 2.2 < φM3+\sqrt{\varphi_{M^{3 +}}} < 3.2 ,

hence M2O3 is an amphoteric oxide.