1.

In one of the industrial processes used for the manufacture of sodium hydroxide, a gas X is formed as a by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in the chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

Answer»
  • 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 calcium oxychloride (bleaching powder) Y. 
  • The reactions are :

2NaCl (aq) + 2H2O(l) → 2NaOH (aq) + Cl2(g) + H2(g) 

X→ Cl2 (Chlorine gas) 

Ca (OH)2 (s) + Cl2 (g) → CaOCl2 (s) + H2O

Y — Calcium oxychloride (bleaching powder)


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