Q39Short answer
In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.
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In the manufacture of sodium hydroxide, hydrogen gas and chlorine gas (X) are formed as by–products. When chlorine gas (X) reacts with lime water, it forms bleaching powder Y. The reactions are 2NaCl (aq) + 2H2O(l) o 2NaOH (aq) + Cl2 (g) + H2(g) X o Cl2 (Chlorine gas) 2 Ca(OH)2 + 2 Cl2 o Ca(ClO)2 + CaCl2 + 2H2O Y — bleaching powder