What do you observe when water is added to quick lime?

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Solution

The reaction of quick lime with water:
When water is added to quicklime (CaO), calcium hydroxide [Ca (OH)₂] or slaked lime is formed and a large amount of heat is evolved with a hissing sound in the process.
$\underset{Quick lime}{CaO (s)} + \underset{Water}{H_{2} O (l)} \to \underset{Slaked lime}{Ca {(OH)}_{2} (s) (↓)} + Heat energy$

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