The correct option is Calcium hydroxide.
Explanation
The reaction between quick lime and water is a classic example of a combination reaction, a type of chemical reaction where two or more substances combine to form a single product. This process is characterized by being highly exothermic.
Detailed Analysis:
- Quick lime is the chemical common name for Calcium oxide (CaO).
- When quick lime reacts vigorously with water, it produces Calcium hydroxide [Ca(OH)2].
- This product is commonly referred to as slaked lime.
- The chemical equation governing this reaction is:
CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat - Calcium carbonate (Limestone) is not formed in this step; rather, it is formed when slaked lime reacts with carbon dioxide in the atmosphere over time.
Key Takeaway: The hydration of Quick lime (Calcium oxide) results in the formation of Slaked lime (Calcium hydroxide) and the release of a significant amount of heat.