SELECT * FROM question_mgmt as q WHERE id=6681 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=377 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Chemical Effects of Electric Current the process that you saw in activity 14 7 is used

Question:

The process that you saw in Activity 14.7 is used for 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 transfered to the thin copper plate. Which electrode should be attached to the positive terminal of battery and why?

Answer:

The thin plate of pure copper is connected to the negative terminal of the battery to make it cathode, while the thick rod of impure copper is connected to the positive terminal of the battery to make it anode; because the copper forms positive ions which are attracted to the electrode and connected to the negative terminal of the battery and gets deposited over it. 


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