First slide

Hydrogen

Question

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

Moderate

A

Mixing natural hydrocarbons of high molecular weight
B

Electrolysis of water
C

Reaction of salt like hydrides with water
D

Reaction of methane with steam

Solution

Hydrogen of high purity is obtained by electrolyzing aqueous barium hydroxide in presence of Ni electrodes.
$2 H_{2} O + 2 e^{-} \overset{}{\to} 2 {OH}^{-} + H_{2} 2 {OH}^{-} \overset{}{\to} H_{2} O + \frac{1}{2} O_{2} + 2 e^{-}$

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