Differentiate between good conductors and bad conductors along with the help of an example.

The water which we get from sources such as taps, hand pumps, well and ponds is good conductor of electricity. Why?

LED is used in a circuit. Explain why.

Name the factors on which chemical effects produce by an electric current depends.

How many types of electrodes are there is in a battery.

British chemist, William Nicholson had shown that if electrodes were immersed in water and a current was passed, bubbles of oxygen and hydrogen were produced. What do your understand by bubbles of hydrogen and oxygen?

Explain the reason of coating of one metal to another metal.

Electroplating is a very useful process. Explain how.

Write any one harm of electroplating.

Acidified water is electrolysed by using carbon electrodes. What is produced at cathode and at anode?

Vinegar is a sour liquid. State whether vinegar conducts electricity or not.

Name two industrial compounds or elements which are obtained by electrolytic method.

Name the metal which is usually electroplated on car parts such as bumpers and bicycle handlebars made of steel.

Fine machine parts can be repaired by which process?

Is sugar an electrolyte or non-electrolyte?

Give two examples of conductor.

Zinc is not plated on iron. Is it correct?

Explain the process to decompose water into hydrogen and oxygen.

Explain, why does a brand new bicycle, have shining handlebar and wheel rims. What will happen if these are accidentally scratched?

For electroplating copper on an iron object, which terminal of the battery is connected to the iron object? Which electrolyte is used for this purpose?

Differentiate between electrolytes and non-electrolyte.

Define cathode and anode.

Why chromium is used for electroplating?

All liquids conduct electricity. Comment.

Are lemon juice, vinegar and tap water, conductors or insulator?

Give an activity to examine the behaviour of the following solid materials towards electricity: plastic, copper, rubber, wood, graphite.

A strip of impure copper metal is given to you. Describe briefly, how you will purify it by using the chemical of electric current.

Show the passing of current through the water with an activity.

Write the applications of electrolysis.