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Write the reaction of the substance ‘X’ named in (i) above with water.

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A solution of a substance 'X' is used for white washing.

(ii) Write the reaction of the substance 'X' named in (i) above with water.

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Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime).
CaO (s)  + H2O (l) → Ca(OH)2 (aq)
Calcium Oxide (Quick Lime) + Water → Calcium Hydroxide (Slaked Lime)

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cao (s) + H2O (i)( acoh ) aq

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