In the given arrangement, if we replace the copper plate connected to the negative terminal of the battery with a carbon rod, which of the following happens?

The mass of the copper plate increases.

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Carbon gets coated on the copper rod.

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Copper gets coated on the carbon rod.

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The mass of the carbon rod decreases.

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Solution

The correct option is C
Copper gets coated on the carbon rod.

If we replace the copper plate which was connected to the negative terminal of the battery with a carbon rod, we obtain a coating of copper on the carbon rod. The copper ions from the solution (copper sulphate) get deposited on the electrodes (carbon rods).

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Q. A carbon rod is to be coated with copper. A battery, a container half-filled with copper sulphate solution, a copper plate and a carbon rod is available. Choose the option with the right set of connections.

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Q. Question 19
In the circuit given as figure, Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore, she took a carbon rod as the negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.

Assertion: Upal observed that copper is deposited on the negative electrode connected to the terminal of the battery. Kavya performed the same experiment but she replaced the copper electrode with a carbon electrode and still observed copper is deposited over carbon rod.

Reason: Copper sulphate solution dissociates into copper and sulphate ions when electricity is passed through dilute copper sulphate solution and this free copper ions deposit on the carbon rod.

Q. When electric current is passed through copper sulphate solution using two copper plates, free copper gets deposited on the electrode connected to the negative terminal of the battery. If we replace the copper plate connected to the negative terminal of the battery by a carbon rod, then

जब कॉपर सल्फेट विलयन में कॉपर की दो प्लेटों के उपयोग से विद्युत धारा गुजारी जाती है, तब स्वतंत्र कॉपर (ताँबा) बैटरी के ऋणात्मक टर्मिनल से संयोजित इलेक्ट्रॉड पर निक्षेपित हो जाता है। यदि हम बैटरी के ऋणात्मक टर्मिनल से संयोजित कॉपर की प्लेट को एक कार्बन छड़ से प्रतिस्थापित करते हैं, तब

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