EASY
8th CBSE
IMPORTANT
Earn 100

How does the process of electrolysis help in the purification of metals?

Important Questions on Chemical Effects of Current

EASY
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 1
Is air a good or bad conductor of electricity? Give reasons.
EASY
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 2
What would happen if the electric current is allowed to flow in a freshly cut potato?
EASY
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 3
Ruchi wants to put a coating of silver on an iron spoon. She used silver nitrate solution as the electrolyte. She took a silver plate as an electrode. To which terminal of the battery should she connect the spoon and silver plate?
MEDIUM
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 4
Why is electroplated jewellery in demand?
EASY
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 1
Seawater is a better conductor of electricity than tap water. Why?
EASY
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 2
Why are all electric wires made mostly of copper metal?
EASY
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 3
The tester used by the electrician has a plastic handle. Comment.
MEDIUM
8th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 18 - Chemical Effects of Current>EXERCISE>Q 4
Tin is electroplated on iron cans which are used to store food. Give reason.