On electrolysis of water, oxygen is collected at:

cathode

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anode

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oxygen is not formed

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abode

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Solution

The correct option is B anode
On electrolysis of water, oxygen is collected at a positive electrode, known as anode and hydrogen is collected at negative electrode, known as the cathode.

So, the correct option is $B$

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during the electrolysis of water why is the volume of hydrogen collected is twice the volume of oxygen collected??

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H_{2} (g) + O_{2} (g)

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