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Question

Which gas is evolved at the anode during electrolysis of water?

A
Hydrogen
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B
Chlorine
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C
Nitrogen
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D
Oxygen
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Solution

The correct option is D Oxygen
The chemical formula of water is H2O. During its electrolysis, water dissociates into hydrogen and oxygen ions. The hydrogen gas is collected at the cathode and oxygen gas is collected at the anode.

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