Question

what yu mean by

amphoteric oxides and give eg..

tell me wht are allotropes????

Answer 1

amphoteric means: the element which can react with both acid and base
eg: Al and Zn
allotropes means the isotopes or the derived mater's eg the Buckminster fulleren, diamond,graphite are the allotrope of. carbon

Answer 2

The oxides which can act as both acid as well as base or which can react with both acid and base.
Example--BeO, Al2O3, ZnO