1. Which of the following is a chemical change? Melting of ice Boiling of water Rusting of Iron Tearing of paper None What is the chemical formula of quick lime? Ca(OH)₂ CaCO₃ CaO CaCl₂ None Which of the following represents a displacement reaction? Zn + CuSO₄ → ZnSO₄ + Cu HCl + NaOH → NaCl + H₂O CaCO₃ → CaO + CO₂ AgNO₃ + NaCl → AgCl + NaNO₃ None What type of reaction is: 2Mg + O₂ → 2MgO Decomposition Combination Double displacement Displacement None Which reaction is an example of thermal decomposition? 2KClO₃ → 2KCl + 3O₂ Zn + HCl → ZnCl₂ + H₂ AgNO₃ + NaCl → AgCl + NaNO₃ H₂ + Cl₂ → 2HCl None Which gas is evolved when zinc reacts with dilute HCl? CO₂ H₂ O₂ N₂ None A solution turns red litmus blue. It is likely to be: Acidic Basic Neutral Salt None Which of the following is not a physical change? Melting of wax Boiling of water Burning of candle Breaking of glass None What type of reaction is: Fe + CuSO₄ → FeSO₄ + Cu? Displacement Combination Decomposition Neutralization None Which of the following reactions is a redox reaction? 2H₂ + O₂ → 2H₂O CaCO₃ → CaO + CO₂ AgNO₃ + NaCl → AgCl + NaNO₃ BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl None Name Email Time's upTime is Up!
