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Question
The process that you saw in the image is used for the purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?
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Solution
The rod of the impure copper plate should be connected to the battery's positive terminal. Because when an electric current is sent through a copper sulphate solution, it separates into copper and sulphate ions. The free copper is drawn to the battery's negative terminal and deposited on it. On the other hand, the impure copper rod connected to the battery's positive terminal would gain back the copper lost in the solution.
RELATED QUESTIONS
If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ______ terminal of the battery.
In an electrolyte the current is due to the flow of ______.
Electroplating is an example for ______.
Electroplating of ______ is done on objects like water taps and cycle bell to give them a shiny appearance.
Why is tin electroplated on iron to make cans used for storing food?
A chemical reaction happens when electricity passes through various conducting liquids.
Liquids that conduct electricity are the solutions of ______.
Match the following
| 1. | Anode | a. | Conducting solution |
| 2. | Cathode | b. | Positive terminal |
| 3. | Ions | c. | Negative terminal |
| 4. | Electrolyte | d. | Positively or negatively charged |
Assertion: Parts of cars and bicycles are made iron with chromium coating.
Reason: Chromium does not corrode and resist scratches.
What are anodes and cathodes?
