If $C O_{2}$ is passed in excess into lime water, the milkiness first formed disappears due to

reversal of the original reaction

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formation of volatile calcium derivative

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formation of water soluble calcium bicarbonate

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the solution getting heated by exothermic reaction

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Solution

The correct option is C formation of water soluble calcium bicarbonate
$C a O + C O_{2} \to C a C O_{3}$

$C a C O_{3} + H_{2} O + C O_{2} \to C a (H C O_{3})_{2}$

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