Advertisements
Advertisements
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?
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.
APPEARS IN
RELATED QUESTIONS
Name three liquids, which when tested in the manner shown in Figure, may cause the magnetic needle to deflect.
Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B as shown in the figure.
 |
 |
| Boojho's Experiment | Paheli's Experiment |
| (A) | (B) |
They found that the bulb in the set up A glows more brightly as compared to that of the set up B. You would conclude that
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off, the waste of the factory
Which of the following metals is used in electroplating to make objects appear shining?
The object to be electroplated is taken as ______ electrode.
One of the most common applications of chemical effect of electric current is ______.
In the circuit given in the 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 be still deposited on the carbon rod? Explain your answer.
A chemical reaction happens when electricity passes through various conducting liquids.
Explain the following:
Short circuit.
State some advantages of electroplating.
