When water is added to quick lime the reaction is

explosive

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endothermic

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exothermic

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Solution

The correct option is C exothermic
Explanation :

$C a O_{(s)} + H_{2} O_{(l)} \to C a (O H)_{2 (s)} Δ H << 0$

The $Δ$ $H$ value for the reaction is highly negative and so it is exothermic.

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