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NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

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Question : 29
Total: 74
How can you prepare Cl‌2 from HCl and HCl from Cl‌2 ? Write reactionsonly.
Solution:  
Preparation of chlorine by Deacon’s process : By oxidation of hydrogen chloride gas by atmospheric oxygen in the presence of CuCl2 at 723 K
4HCl+O2
CuCl2
––––––––▶
2Cl2+2H2O
Preparation of HCl : Cl‌2 can be reduced to HCl by reaction of H‌2 in thepresence of diffused sunlight.
H2+Cl2
Diffused
––––––––▶
Sunlight
2HCl
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