The apparatus which is used at C is known as

Anode

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Cathode

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Salt bridge

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Ion bridge

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Osmotic bridge

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Solution

The correct option is C Salt bridge
The apparatus which is used at C is known as salt bridge. It is a U shaped glass tube containing a saturated solution of an electrolyte such as KCl or ammonium nitrate and 5% agar solution. It provides electrical contact between two solutions and completes the electrical circuit. It prevents mixing of electrode solutions.

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