JEE Main · 2012 · 29 Apr 2012 · Offline · Hydrogen

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 weight
(C)Electrolysis of water✓ Correct
(D)Reaction of salt like hydrides with water

Answer: (C)

Solution

Electrolysing water,

2 H_{2} O \to 2 H_{2} + O_{2}

, liberates hydrogen at the cathode with no carbon-bearing by-products, so the gas can reach a purity of the order of

99.9%

. Routes such as steam reforming of methane or the action of water on metal hydrides deliver hydrogen mixed with other gases and need further purification. Electrolysis of water is therefore the method that gives very pure hydrogen.

JEE Main · 2012 · 29 Apr 2012 · Offline · Single correct option

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