4. Chemical Effects of Electric Current.

4. Chemical Effects of Electric Current.

14 Maths Exercise Solutions

Fill in the blank.
Most liquids that conduct electricity are solutions of ___, ___ and ___.
4.4 Exercises., Question No.1
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Most liquids that conduct electricity are solutions of ___, ___ and ___.
Fill in the blank.
The passage of an electric current through a solution causes ___ effects.
4.4 Exercises., Question No.2
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The passage of an electric current through a solution causes ___ effects.
Fill in the blank:
If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ___ terminal of the battery.
4.4 Exercises., Question No.3
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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.
Fill in the blank.
The process of depositing a layer of any desired metal on another material by means of electricity is called ___.
4.4 Exercises., Question No.4
Fill in the blank.
The process of depositing a layer of any desired metal on another material 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?
4.4 Exercises., Question No.5
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 deflect.

4.4 Exercises., Question No.6
Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect.

The bulb does not glow in the setup shown in figure. List the possible reasons. Explain your answer.

4.4 Exercises., Question No.7
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,labelled and . It is found that the bulb of the tester glows brightly for liquid while it glows very dimly for liquid . You would conclude that.（ ）
A. liquid is a better conductor than liquid .
B. liquid is a better conductor than liquid .
C. both liquids are equally conducting.
D. conducting properties of liquid cannot be compared in this manner.
4.4 Exercises., Question No.8
A tester is used to check the conduction of electricity through two liquids,labelled and . It is found that the bulb of the tester glows brightly for liquid while it glows very dimly for liquid . You would conclude that.（ ）
A. liquid is a better conductor than liquid .
B. liquid is a better conductor than liquid .
C. both liquids are equally conducting.
D. conducting properties of liquid cannot be compared in this manner.
Does pure water conduct electricity? If not, what can we do to make it conducting?
4.4 Exercises., Question No.9
Does pure water conduct electricity? If not, what can we do to make it conducting?
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.
4.4 Exercises., Question No.10
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.