Какая из указанных ниже реакций окислительно-восстановительная?

а) Zn(OH)₂+2KOH=K₂ZnO₂+2H₂O
б) Zn+2KOH=K₂ZnO₂+H₂
в) Zn(OH)₂+H₂SO₄=ZnSO₄+2H₂O
г) 2ZnSO₄+2H₂O⇄(ZnOH)₂SO₄+H₂SO₄
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