First slide

Hydrogen

Question

Purest form of hydrogen is obtained by

Easy

A

Petroleum industry
B

Electrolysis of water
C

Reaction of metals with acids
D

Steam with coke

Solution

Pure form of hydrogen [Purity > 99.9%] is obtained by the electrolysis of acidified (or) alkaline water by using platinum electrodes.
$\large \begin{array}{*{20}{c}} {At\;Anode\;\;\;\;\;:\;2{H_2}O\; \to \;4{H^ + }\; + \;{O_2}\; + \;4{e^ - }} \\ {At\;Cathode\;:\;4{H^ + }\; + 4{e^ - }\; \to \;2{H_2}\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;} \\ {Net\;reaction\;:\overline {2{H_2}O\;\;\; \to 2{H_2}\; + \;{O_2}\;\;\;\;\;\;\;\;\;\;\;\;\;} } \end{array}$

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