What happen when quick lime is exposed to atmosphere?

Abosorb moisture present in atmosphere

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Absorb carbon dioxide present in atmosphere

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Neither a nor b

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(a) and (b) above.

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Solution

The correct option is D (a) and (b) above.
CaO is a compound that absorbs moisture and $C O_{2}$ easily on exposure to atmosphere.
$C a O + H_{2} O ⟶ C a (O H)_{2} C a O + C O_{2} \to C a C O_{3}$
Hence, option a and b are the correct answer.

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