Give reasons for each of the following
On addition of water to quicklime, along with formation of `Ca(OH)_2`, energy is produced.

Explanation

To understand why energy is produced when water is added to quicklime (calcium oxide, CaO), leading to the formation of calcium hydroxide (Ca(OH)₂), we can break down the explanation into several steps:

### Step 1: Identify the Reactants
When water (H₂O) is added to quicklime (CaO), the primary reactants involved in the reaction are calcium oxide and water.

### Step 2: Write the Chemical Reaction
The chemical reaction that takes place can be represented as:
\[ \text{CaO (s)} + \text{H}_2\text{O (l)} \rightarrow \text{Ca(OH)}_2 (aq) \]
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