two reagents that are needed to show that an oxide is amphoteric
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Please consider that amphoteric behaviour is of dual type,
with acid it behaves chemically as a base
while with base it will behave chemically as an acid .
inorder to ascertain both one has to use two reagents i.e.an acid as well as base .
e.g. ZnO + 2HCl → ZnCl2 +H2O.
ZnO +2 NaOH → Na2ZnO2 +H2O.
Explanation:
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