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a) Al3+ N5+ O2-; Ca2+ P5+ O2-; H+ N5+ O2-; Mg2+ S2-
b) H+ Cl7+ O2-; S4+ O2-; H+ Br-; Na+ H-
c) Zn2+; C4+ O2-; H+ S6+ O2-; Cu+; Mn7+ O2-
2
a) +5; -3; +5; -3
b) -4; +2; +4; +4; +4; -4
3.
+2; +7; +4; +6; +2