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Chemical Effects of Electric Current
Give a brief account of LED.
LED is Light Emitting Diode. LED consists of a bulb, two legs called leads. One leg is longer than the other. Longer leg is attached to the positive terminal of the battery and shorter leg is attached to the negative terminal of the battery. Even a small amount of current will make the LED glow.
LEDs are as shwon below in the figure: 
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If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.
The process of depositing a layer of any desired metal on another material object by means of electricity is called _______________.
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to direct.
The bulb does not glow in the setup shown in figure. List the possible reasons. Explain your answer.
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
Does pure water conduct electricity? If not, what can we do to make it conducting?
In case of fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
A child staying in the 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?
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.
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