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(i) Solution of a substance 'X' is used ...

(i) Solution of a substance 'X' is used for testing carbon dioxide . Write the equation of the reaction of 'X' with carbon dioxide.
(ii) How is 'X' obtained? Write chemical equation.

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(i) Substance X-Calcium Hydroxide.
`Ca(OH)_(2)(aq)+CO_(2)(g)rarr underset (("White ppt."))(CaCO_(3)(S))+H_(2)O`
(ii) Calcium hydroxide is obatined by reaction of calcium oxide and water.
`CaO(s)+H_(2)O(l)rarr Ca(OH)_(2)(aq)+"Heat"`
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