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1. taller, not tallest2. shortest 3. was4. were 5. never go6. visited 7. is visiting 8. are playing

Mg²⁺ + CO₃²⁻  = MgCO₃↓ 2Na⁺ + CO₃²⁻ + Mg²⁺ +2Cl⁻ = MgCO₃↓ + 2Na⁺ + 2Cl⁻Na₂CO₃ + MgCl₂ = MgCO₃↓ + 2NaClCaCO₃ + 2H⁺ = Ca²⁺ + CO₂↑ + H₂OCaCO₃ + 2H⁺ + 2Cl⁻ = Ca²⁺ + 2Cl⁻ + CO₂↑ + H₂OCaCO₃ + 2HCl = CaCl₂ + CO₂↑ + H₂OCO₃²⁻ + 2H⁺  = H₂O + CO₂↑2K⁺ + CO₃²⁻ + 2H⁺ + 2NO₃⁻ = 2K⁺ + 2NO₃⁻ + H₂O + CO₂↑K₂CO₃ + 2HNO₃ = 2KNO₃ + H₂O + CO₂↑2H⁺ + SiO₃²⁻ = H₂SiO₃ 2Na⁺ + SiO₃²⁻ + 2H ⁺+ 2Cl ⁻= H₂SiO₃ + 2Na⁺ + 2Cl⁻Na₂SiO₃ + 2HCl = H₂SiO₃ + 2NaCl