Compounds where a metalloid with a relatively high oxidation number bears a hydroxyl group are usually amphoteric and impossible to predict.
What is a metalloid?
A metalloid is an element whose properties lie at te boarder line between the properties of metals and nonmetals . This means that a metalloid can behave as an acid/base.
Hence, compounds where a metalloid with a relatively high oxidation number bears a hydroxyl group are usually amphoteric and impossible to predict.
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