Осуществите цепочки превращений:
а) Cu0 → Cu2+ → Cu2+ → Cu0 → Cu2+
б) Fe0→Fe3+ →Fe0 →Fe2+ → Fe2+
в) Са2+ → Са0→Са2+ → Са2+
г) Zn2+ → Zn0→Zn2+ → Zn2+
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