MEDIUM
8th CBSE
IMPORTANT
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If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the (positive / negative) terminal of the battery.

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Important Questions on Chemical Effects

EASY
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 1
The process of depositing a layer of any desired metal on another material by means of electricity is called _____.
MEDIUM
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 2
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
EASY
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 3

Name three liquids which when tested in the manner shown in figure may cause the magnetic needle to deflect?

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MEDIUM
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 4
The bulb does not glow in the setup shown in figure. List the possible reasons. Explain your answer.
MEDIUM
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 5

A 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.

MEDIUM
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 6
Does pure water conduct electricity? If not, what can we do to make it conducting?
MEDIUM
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 7
In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
EASY
8th CBSE
IMPORTANT
Start Up Science>Chapter 12 - Chemical Effects>Some Questions from NCERT>Q 8
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?