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

Question

Very pure hydrogen (99.9 %) can be made by which of the following processes ? (A) Reaction of methane with steam (B) Mixing natural hydrocarbons of high molecular weig (C) Electrolysis of water (D) Reaction of salts like hydrides with water

Tardigrade Admin · Accepted Answer

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) ⟶ O_{2} (g) + 4 H_{3} O^{+} + 4 e^{-}

cathode,

4 e^{-} + 4 H_{2} O (l) ⟶ 2 H_{2} (g) + 4 O H^{-}

(aq)
Overall

⟶ 2 H_{2} O (l) ⟶ 2 H_{2} (g) + O_{2} (g) %

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

Reaction of methane with steam

Mixing natural hydrocarbons of high molecular weig

Electrolysis of water

Reaction of salts like hydrides with water

Highly pure hydrogen can be obtained by electrolysis of water. It is the decomposition of water into O2​&H2​ gas by passing electric current. At anode, 6H2​O(l)⟶O2​(g)+4H3​O++4e− cathode, 4e−+4H2​O(l)⟶2H2​(g)+4OH−(aq) Overall ⟶2H2​O(l)⟶2H2​(g)+O2​(g)%

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