Electrolysis of water is carried out in hoffman voltameter. Litmus is added to both cathodic and anodic compartments. What changes do you observe in the above process at the end of electrolysis? Justify.

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Solution

In the electrolysis of water hydrogen ions are liberated as hydrogen gas at cathode so the hydroxyl ions left are basic in nature. They turn red litmus blue while hydroxyl ions go towards anode in anodic compartment and are liberated. The solution left is acidic which turns blue litmus red.

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In the above setup of voltameter, the electrolysis of NaCl is carried out. What ions will be on A and B?

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0.108 g

O_{2}

0.108 g

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