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Fill in the following blanks with suitable words:
(a) Most liquids that conduct electricity are solutions of ..........., ......... and ............
(b) LED glows even when a ..............electric current passes through it.
(c) The passage of an electric current through a conducting solution causes.............effect.
(d) When electric current is passed through acidified water, then ........and...........are formed.
(e) The process of depositing a layer of any desired metal on another metal by means of electricity is called ..........
(f) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ............terminal of the battery.
A beaker contains an acidified copper sulphate solution. A copper plate and a carbon rod are kept in this copper sulphate solution. The copper plate is connected to the positive terminal of a battery whereas the carbon rod is connected to the negative terminal of the battery. What will you observe when an electric current is passed through this set-up for a considerable time?
When an electric current is passed through a cut potato for a considerable time, a coloured spot is formed around one of the electrodes :
(a) What is the colour of the spot?
(b) Around which electrode (positive or negative electrode) the coloured spot is formed?
(c) Which effect of electric current is involved in this case?
In the process of purification of copper metal, a thin plate of pure copper and a thick rod of impure copper are used as electrodes, and a metal salt solution is used as an electrolyte:
(a) Which electrode is connected to the positive terminal of the battery?
(b) Which electrode is connected to the negative terminal of the battery?
(c) Which metal salt solution is taken as electrolyte?