В предложенных рядах веществ найдите лишнее вещество и почему
1. Na2O, Al2O3, N2O5, PbO.

2. KOH, H2SO4, Ca(OH)2, Mg(OH)2.

3. H2SO4, HCl, KOH, H3PO4.

4. Na2SO4, NaOH, Ca(NO3)2, ZZnCl2
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