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The given compound 'A' is calcium oxychloride because it is an oxidising agent and in open it reacts with CO2 to give the pungent smell of chlorine gas.
CaOCl2 + CO2→ CaCO3 + Cl2.
It is prepared by the action of dry slaked lime with chlorine gas.
Ca(OH)2 + Cl2→CaOCl2 + H2O
Calcium oxychloride is commercially known as Bleaching powder
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