How is sodium hydroxide manufactured in industries? Name the process. In this process, a gas X is formed as a byproduct. This gas reacts with lime water to give a compound Y, which is used as a bleaching agent in the chemical industry. Identify X and Y and write the chemical equation of the reaction involved.
Sodium hydroxide is manufactured by the electrolysis of a concentrated aqueous solution of sodium chloride (Brine).
$2NaCl (aq) + H_2O (l) \xrightarrow {Electrolysis} 2NaOH (aq) + Cl_2 (g) + H_2 (g)$
The process of manufacture of sodium hydroxide by electrolysis process is called the chloralkali process.
Gas X is chlorine gas and compound Y is calcium oxychloride (Bleaching powder).
$Cl_2 (g) + Ca(OH)_2\rightarrow CaOCl_2 + H_2O$
Chlorine Gas (X) + Lime water → calcium oxychloride + water
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