Answer :

During the manufacture of sodium hydroxide (NaOH), hydrogen gas (H2) and chlorine gas Cl2 (X) are formed as by-products. Chlorine gas reacts with lime water [Ca(OH) 2 ]to produce bleaching powder (CaOCl2), a bleaching agent.


Thus X is chlorine gas (Cl2 gas). Y is calcium oxychloride or bleaching powder (CaOCl2).


The chemical equation for the preparation of sodium hydroxide is as follows:




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