What happens when CaO is exposed to atmospheric air? – InterviewSolution

1.

What happens when CaO is exposed to atmospheric air?

Answer»

On exposure to atmosphere, it absorbs moisture and carbon dioxide to form Calcium hydroxide and Calcium carbonate.

CaO +CO₂ ---> CaCO₃

CaO + H₂O ----> Ca(OH)₂

Note; The addition of limited amount of water breaks the lump of lime. This process is called slaking of lime

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