Fill in the blanks.(a) Most liquids that conduct electricity are solutions of .............., .............. and..............(b) The passage of an electric current through a solution causes ............. effect.(c) If you pass, current through copper sulphate solution, copper gets deposited on the plate connected to the ............. terminal of the battery.(d) The process of depositing a layer of any desired metal on another metallic object, by means of electricity, is called.............. .
A tester is used to check the conduction of electricity through two liquids, labeled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that:(i) liquid A is a better conductor than liquid B.(ii) liquid B is a better conductor than liquid A.(iii) both liquids are equally conducting.(iv) conducting properties of liquid cannot be compared in this manner.
A child staying in the coastal region tests the drinking water and also the sea water with his tester. He finds that the compass needle deflects more in the case sea water. Can you explain the reason?
Paheli had heard that rain water is as good as distilled water. So she collected some rain water in a clean glass tumber and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reasons?
The process that you saw in activity 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 transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?
