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Zn + 2H+ + 2 Cl- -> Zn2+ + 2Cl- + H2
Ca + h2so4 -> caso4 + h2
ca + 2h+ + so42- -> caso4 (osad) + h2
Zn⁰ + 2 H⁺ + 2 Cl⁻→ Zn²⁺ + 2Cl⁻ + H₂⁰
Zn⁰ - 2e→Zn²⁺
2H⁺ + 2e → H₂⁰
Ca + H₂SO₄→ CaSO₄ + H₂
Ca⁰ + 2 H⁺ + SO₄²⁻ → CaSO₄(osad) + H₂⁰