What happens when electricity is passed through tap water?

Important Questions on Chemical Effects of Electric Current

MEDIUM

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q E

How will you show experimentally that an electric current can bring about a chemical change? What is this phenomenon called?

HARD

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q E

What is electroplating? How will you carry out electroplating of copper in the laboratory?

HARD

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q E

List four uses of electroplating, giving the reason for electroplating in each case.

EASY

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q 1

Which of these do you think uses less electrical energy- electric bulb or LED?

MEDIUM

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q 2

Mercury is a liquid and conducts electricity. Do you think it is an electrolyte?

EASY

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q 3

Solid copper sulphate does not conduct electricity, but when it is dissolved in water, it does conduct electricity. Why?

EASY

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q 4

Copper conducts electricity through electrons, whereas salt solution conducts electricity through ions. Do you agree?

EASY

8th CBSE

IMPORTANT

Living Science 8>Chapter 18 - Chemical Effects of Electric Current>EXERCISES>Q 5

Why should you not touch electrical appliances with wet hands?