Формулы амфотерного гидроксида,основного оксида,соли соответственно:
1)NaOH,СаО, H2SO4
2)Cu2O,Zn(OH)2, KCl
3)H2SiO3,Al2O3, CaCO3
4)Zn(OH)2,Na2O, KNO3
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