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प्रश्न
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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उत्तर
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.
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संबंधित प्रश्न
The passage of an electric current through a solution causes ______ effects.
If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ______ terminal of the battery.
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Paheli set up an experiment using liquid A in the beaker as shown in the following figure. She observed that the bulb glows. Then she replaced the liquid A by another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain.
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 negative electrode. Will copper still be deposited on the carbon rod? Explain your answer.
A chemical reaction happens when electricity passes through various conducting liquids.
Explain the following:
Short circuit.
______ is used in the extraction and purification of metals.
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 |
State some advantages of electroplating.
