NCERT Class XI Chemistry Hydrogen Solutions
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Question : 5
Total: 36
Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process?
Solution:
Dihydrogen is prepared by the electrolysis of water using platinum electrodes in the presence of a small amount of acid or alkali.
2 H 2 O ( l )
2 H 2 ( g ) + O 2 ( g )
During electrolysis, the reactions that take place are :
H 2 O H + + O H −
At cathode :
H + + e −
H + H →H 2 ( g )
At anode :
4 O H − 4 O H + 4 e −
4OH →2 H 2 O ( l ) + O 2 ( g )
The hydrogen prepared by this method is of very high purity.
During electrolysis, the reactions that take place are :
At cathode :
H + H →
At anode :
4OH →
The hydrogen prepared by this method is of very high purity.
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