RRB Group-D Model Paper 19 with answers for online practice

Question : 62 of 100

Marks: +1, -0

Choose the correct method which can be used to decompose water into its constituent elements.

Solution:

Splitting water into its two components (hydrogen and oxygen) by passing a current through it, is called water electrolysis.
Water molecules naturally disassociate into $H^{+}$ and $OH^{-}$ ions, which are pulled toward the cathode and anode, respectively.
At the cathode, two H+ ions pick up electrons and form $H_2$ gas.
At the anode, four OH- ions combine and release $O_2$ gas, molecular water, and four electrons.

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