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Which of the following reacts vigorously with water to produce slaked lime releasing a large amount of heat?

Which of the following reacts vigorously with water to produce slaked lime releasing a large amount of heat? Correct Answer Calcium oxide

The correct answer is Calcium oxide.

Explanation:

  • Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.

CaO (s) + H2O (l) → Ca(OH)2 (aq) + Heat

  • In the above reaction, calcium oxide and water combine to form a single product, calcium hydroxide. Such a reaction in which a single product is formed from two or more reactants is known as a combination reaction.
  • The reaction produces a slaked lime solution, which is used to whitewash walls. Calcium hydroxide slowly reacts with carbon dioxide in the air, forming a thin layer of calcium carbonate on the walls. After two to three days of whitewashing, calcium carbonate forms and gives the walls a shiny finish.

Ca(OH)2 (aq) + CO2 (g) → CaCO3 (s) + H2O (l)

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