Осуществить цепочки превращений:
1) Zn→ZnCl2→Zn(OH)2→ZnO→Zn(NO3)2
2)P→P2O5→H3PO4→Na3PO4→Ca3(PO4)2
3)Al→Al2O3→AlCl3→Al(OH)3→Al2O3
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