Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following gas is formed at the electrode connected to the negative terminal of the battery?

A
Nitrogen gas

B
Hydrogen gas

C
Oxygen gas

D
Carbon dioxide gas

Solution

On electrolysis of water Oxygen bubbles are formed on the electrode connected to the positive terminal of the battery and hydrogen bubbles formed on the other electrode.
Question 2
1 / -0

Which of the following is a chemical effect of electric current?

A
Formation of gas bubbles on the electrodes

B
Change of color of solution

C
Deposition of metals on the electrodes

D
All of the above

Solution

Formation of gas bubbles on the electrodes, change of colour of solution, deposition of metals on the electrodes are some of the chemical effects of electric current.
Question 3
1 / -0

Which of the following is added to make the copper sulphate solution more conducting?

A
Hydrochloric acid

B
Sulphuric acid

C
Nitric acid

D
Carbonic acid

Solution

Sulphuric acid is added to the copper sulphate solution to make it more conducting.
Question 4
1 / -0

When electric current is passed through water, hydrogen is deposited over :

A
positive pole

B
negative pole

C
no dissociation

D
both the poles

Solution

When electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.
Question 5
1 / -0

Assertion:Chromium plating is done on many objects like car parts, wheel rims and bath taps.
Reason:The chromed layer can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness.

A
Assertion is correct and Reason is incorrect

B
Assertion is incorrect and Reason is correct

C
Both Assertion and Reason is correct and Reason is the correct explanation of Assertion

D
Both Assertion and Reason is correct but Reason is not the correct explanation of Assertion

Solution

Both the statement are correct and explains the assertion. Chromium avoids corrosion and increase the hardness thus increasing the life of the iron materials like rims and car parts. It can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness.
Question 6
1 / -0

Which of the following is an example of electroplating?

A
Coating of chromium on many objects such as bath taps, car parts, etc.

B
Coating of gold or silver on less expensive metals

C
Coating of zinc on tin to make cans

D
All of the above

Solution

Electroplating is the process of depositing a layer of any desired metal on another material by means of electricity.

Coating of chromium on many objects such as bath taps, car parts, etc., coating of gold or silver on less expensive metals; coating of zinc on the tin to make cans are all examples of electroplating.
Question 7
1 / -0

When electric current is passed through water, dissociation is indicated __________.

A
in the form of bubbles

B
by color change

C
both a and b

D
none of above

Solution

When electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.
Question 8
1 / -0

Chemical effect of electric current may cause :

A
formation of gas bubbles at the electrodes

B
deposit of metal on the electrodes

C
change in colour of the solution

D
all of above

Solution

When electric current passes through a conducting solution, it causes chemical reactions. This is called electrolysis and the effect is the chemical effects of electric current. The chemical effect of electric current may cause the formation of gas bubbles at the electrodes, deposition of metal on the electrodes and change in colour of the solution.
Question 9
1 / -0

A tester is used to check the conduction of electricity through two liquids, labeled $$A$$ 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:

A
liquid $$A$$ is a better conductor than liquid $$B$$

B
liquid $$B$$ is a better conductor than liquid $$A$$

C
both liquids are equally conducting

D
conducting properties of liquid cannot be compared in this manner

Solution

The amount of current flowing through a conducting solution depends on the conductivity of the solution. More the conductivity, more current passes through the solution and vice-versa. Hence, the conductivity of liquid $$A$$ is more than the conductivity of liquid $$B$$.
Question 10
1 / -0

Tin cans are the tin electroplated on iron. These Tin cans are used to preserve food items. Why not iron cans used without Tin coating?

A
Tin is less reactive than Iron

B
Tin is more reactive than Iron

C
Tin is cheaper than Iron

D
Tin is lighter than Iron

Solution

Tin cans are thin electroplated on iron. These tin cans are used to preserve food items. Because tin is less reactive than iron as it will prevent food from being poisoned.

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Chemical Effects of Electric Current Test - 16

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Chemical Effects of Electric Current Test - 16

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Question 1

Nitrogen gas

Hydrogen gas

Oxygen gas

Carbon dioxide gas

Solution

Question 2

Formation of gas bubbles on the electrodes

Change of color of solution

Deposition of metals on the electrodes

All of the above

Solution

Question 3

Hydrochloric acid

Sulphuric acid

Nitric acid

Carbonic acid

Solution

Question 4

positive pole

negative pole

no dissociation

both the poles

Solution

Question 5

Assertion is correct and Reason is incorrect

Assertion is incorrect and Reason is correct

Both Assertion and Reason is correct and Reason is the correct explanation of Assertion

Both Assertion and Reason is correct but Reason is not the correct explanation of Assertion

Solution

Question 6

Coating of chromium on many objects such as bath taps, car parts, etc.

Coating of gold or silver on less expensive metals

Coating of zinc on tin to make cans

All of the above

Solution

Question 7

in the form of bubbles

by color change

both a and b

none of above

Solution

Question 8

formation of gas bubbles at the electrodes

deposit of metal on the electrodes

change in colour of the solution

all of above

Solution

Question 9

liquid $$A$$ is a better conductor than liquid $$B$$

liquid $$B$$ is a better conductor than liquid $$A$$

both liquids are equally conducting

conducting properties of liquid cannot be compared in this manner

Solution

Question 10

Tin is less reactive than Iron

Tin is more reactive than Iron

Tin is cheaper than Iron

Tin is lighter than Iron

Solution

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