In electrolysis of water (acidified), the gases that are evolved at anode and cathode respectively are ___ and _.

hydrogen and oxygen

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hydrogen and chlorine

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chlorine and oxygen

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oxygen and hydrogen

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Solution

The correct option is D
oxygen and hydrogen

In electrolysis of water (acidified), the gases that are evolved at anode and cathode respectively are oxygen and hydrogen. Hydrogen ions gain electrons from cathode and forms hydrogen gas, oxygen ions gives electrons to anode and forms oxygen gas.

The decompsition reaction of water is:

$2 H_{2} O (l) \to 2 H_{2} (g) + O_{2} (g)$

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