Questions  

Very pure hydrogen (99.9%) can be made by which of the following processes?

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By Expert Faculty of Sri Chaitanya
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a
The reaction of salt-like hydrides with water
b
The reaction of methane with steam
c
Mixing natural hydrocarbons of high molecular weight
d
Electrolysis of water
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detailed solution

Correct option is D

Electrolysis of water yields incredibly clean hydrogen.

Through the use of electric current, water is converted into O2 and H2 gas.

Reaction to the anode,

6H2O(l)O2(g)+4H3O++4e

Reaction on the cathode,

 4e+4H2O(l)2H2(g)+4OH(aq)

The overall reaction is,

2H2O(l)2H2(g)+O2(g)%


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