Q. 74.8( 10 Votes )

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.

Answer :

X: This is Chlorine (Cl2) gas


Y: This is Bleaching powder or calcium hypochlorite(CaOCl2)


NaOH is used in many industrial processes. One of the most popular methods in salt water brine (ratio of salt to water for a brine is 4 tablespoons of salt per 4 cups of water.)


Chemical equations of the reactions involved are as follows:


I) 2NaCl + 2H2O 2NaOH + Cl2 (X) + H2


II) Cl2 (X) + Ca(OH)2 CaOCl2 (Y) + H2O


where NaCl is sodium chloride, H2O is water, NaOH is sodium hydroxide, Cl2 is chlorine gas, Ca(OH)2 is calcium hydroxide and CaOCl2 is bleaching powder.


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