25 Heated Limestone X + CO2 Step 1 + H2O Step 2 Slaked lime Identify the correct option from the given table which represents the type of reactions occurring in step 1 and step 2. endothermic exothermic A Х х B С Х D
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The correct answer is option (C) Step 1- Endothermic Step 2- Exothermic
When limestone is heated, it decomposes to form calcium oxide (marked as X) and carbon dioxide. This is an Endothermic reaction as heat is absorbed in this reaction.
CaCO₃(s) ₊ Heat → CaO(s) ₊ CO₂(g)
When calcium oxide is dissolved in water, it forms slaked lime. This is an Exothermic reaction as heat is evolved during this process.
CaO(s) ₊H₂O(l) → Ca(OH)₂(aq) ₊ Heat
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