In the reaction-
$\begin{matrix} C a O & + & H_{2} O & \to & C a (O H)_{2} & + H e a t e n e r g y C a l c i u m o x i d e & W a t e r & C a l c i u m h y d r o x i d e \end{matrix}$

The possible state of $C a (O H)_{2}$ is:

Liquid.

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Aqueous.

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Gaseous.

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Solid.

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Solution

The correct option is B Aqueous.
$C a O + H_{2} O \to C a (O H)_{2} +$ Heat energy

The above reaction is an exothermic reaction and as the reaction involves water, to contain the reaction heat energy the $C a (O H)_{2}$ will be having aqueous state.

Hence, the correct option is $B$

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