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

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

AIEEEAIEEE 2012Hydrogen

Solution:

Highly pure hydrogen can be obtained by electrolysis of water.
It is the decomposition of water into $O _{2} \& H _{2}$ gas by passing electric current.
At anode, $6 H _{2} O ( l ) \longrightarrow O _{2}( g )+4 H _{3} O ^{+}+4 e ^{-}$
cathode, $4 e ^{-}+4 H _{2} O ( l ) \longrightarrow 2 H _{2}( g )+4 OH ^{-}$(aq)
Overall $\longrightarrow 2 H _{2} O ( l ) \longrightarrow 2 H _{2}( g )+ O _{2}( g ) \%$