Very pure hydrogen (99.9%) can be made by which of the following processes ?
(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
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(c) Hydrogen of high purity is obtained by electrolysing aqueous barium hydroxide in presence of Ni electrodes.