Skip to content Home Questions Play Progress Daily Challenge Questions › Chemistry › Chemical Reactions and Equations Questions QUESTION Which listed substance is correctly paired with its formula? Open question → QUESTION What is the product formed in aqueous solution when calcium carbonate reacts with carbon dioxide and water? Open question → QUESTION In the usual iron-nail displacement experiment, a ______ copper(II) sulphate solution becomes ______ as iron(II) sulphate forms. Open question → QUESTION Which of the following statements is correct? Open question → QUESTION Which listed substance is NOT a product of the usual thermal decomposition of lead nitrate? Open question → QUESTION When carbon dioxide gas is bubbled through freshly prepared lime water, what is the nature of the precipitate formed? Open question → QUESTION Assertion (A): When aqueous solutions of sodium sulphate and barium chloride are mixed, a white precipitate is formed. Reason (R): Barium sulphate is insoluble… Open question → QUESTION Heating lead nitrate produces brown fumes. Which gas causes this colour? Open question → QUESTION Consider the following statements: 1. A physical change is generally reversible and no new substance is formed. 2. A chemical change results in the… Open question → QUESTION When electricity is passed through water, what kind of chemical reaction occurs? Open question → QUESTION Match the decomposition reactions with the reaction-type labels. Reaction | Type A. Decomposition of H₂O |1. Redox reaction B. Decomposition of NaH |2. Redox… Open question → QUESTION Which listed product is formed in the ammonia–brine reaction NaCl + H₂O + CO₂ + NH₃ → NaHCO₃ + NH₄Cl? Open question → QUESTION Which of the following chemical reactions takes place when quicklime reacts with water? Open question → QUESTION For the reaction 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g), which statements are true? (i) Nitrogen is oxidised. (ii) Oxygen is oxidised. (iii) Nitrogen… Open question → QUESTION Which listed gas produces the characteristic orange-red glow in a low-pressure electrical discharge? Open question → QUESTION In the electron-transfer description of a redox reaction between a reducing agent and an oxidising agent, which listed process occurs? Open question → Home Questions Play Progress 