Which metal hydroxides are explicitly named as common examples of amphoteric substances?
Answer
Aluminum ($ ext{Al}( ext{OH})_3$), chromium ($ ext{Cr}( ext{OH})_3$), zinc ($ ext{Zn}( ext{OH})_2$), and lead ($ ext{Pb}( ext{OH})_2$).
The text lists the hydroxides of aluminum, chromium, zinc, and lead as common examples of sparingly soluble compounds that exhibit amphoterism.

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