class 8
 Class–VIII (CHAPTER-14) CHEMICAL EFFECT OF ELECTRIC CURRENT
Questions 1. Fill the blanks.
(a) Most liquids that conduct electricity are solutions of ________, __________ and __________.
 (b) The passage of an electric current through a solution causes ________ effects.
(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 material by means of electricity is called ____________.


2A tester is used to check the conduction of electricity through two liquids. Labelled 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.
 2. Does pure water conduct electricity? If not, what can we do to make it conducting?
3. In case of fire, before the firemen use the water hoses, they shut off the main electric supply for the area. Explain why they do this.
 4. A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
5. Is it safe for the electrician to carry out electrical repairs outdoors during heavy rain pour? Explain.
6. Paheli had heard that rainwater is as good as distilled water. So, she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reason?
7. Prepare a list of objects around you that are electroplated.