Chemical Effects of Current Test

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Chemical Effects of Current Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

An electrochemical cell stops working after some time because

A
one of the electrodes is eaten away

B
electrode potentials of both the electrodes become equal

C
electrode potentials of both the electrodes go on decreasing

D
electrode potentials of both the electrodes go on increasing

Solution

Current flows in a circuit along the potential gradient and it will continue to flow in an electrochemical cell only till the two electrodes are at a different potential.

Thus an electrochemical cell stops working after some time because electrode potentials of both the electrodes become equal.
Question 2
1 / -0

Why is it advised to wear rubber slippers while handling the electrical appliances?

A
because rubber is flexible

B
because rubber is soft

C
because rubber is an insulator

D
because rubber melts on heating

Solution

Human bodies are conductors of electricity and any leakage of the current in the appliance will flow towards the earth through our body

Rubber is an insulator, and wearing rubber slippers while operating an electrical appliance helps to prevent electric shock.
Question 3
1 / -0

When the current through a circuit is too weak, the bulb does not glow because the

A
outer surface of the bulb does not get heated sufficiently

B
inner surface of the bulb does not get heated sufficiently

C
gases (argon or nitrogen) inside the bulb are not heated sufficiently

D
filament of the bulb does not get heated to a sufficiently high temperature

Solution

The tungsten filament of the bulb being a resistor gets heated and glows. This is the heating effect of the electric current.
If the current in the circuit is too low, then the filament is not heated sufficiently enough to make it glow.
Question 4
1 / -0

What happens when electric current is passed through a silver nitrate solution?

A
The solution boils.

B
The solution produces bubbles and dries up.

C
The solution dissociates into silver and nitrate ions.

D
The solution remains unaffected.

Solution

When electric current passes through a silver nitrate solution, the solution decomposes into positively charged silver ions and negatively charged nitrate ions. These positively charged silver ions get attracted towards the plate, which is connected to the negative terminal of a battery. Ag⁺ ions get reduced at the cathode and gradually, a layer of silver builds up on the plate.
Question 5
1 / -0

Which of the following statements is/are false?

a. A solution of hydrochloric acid or sulphuric acid in water conducts electricity.
b. Vinegar does not conduct electricity as it is a solution of a non- electrolyte
c. An arrangement having two electrodes kept in a conducting liquid in a vessel is called an electrolytic cell.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

Vinegar does conduct electricity as it is a solution of acid and all acids are electrolytes and dissociate into ions.
Question 6
1 / -0

Which of the following solutions are non-electrolytes?

a. Glucose solution
b. Vinegar solution
c. Alcohol solution
d. Common salt solution

A
Only a and b

B
Only a and c

C
Only a and d

D
Only b and c

Solution

Glucose solution and alcohol solution are non-electrolytes and do not dissociate into ions in their aqueous solutions. They are non-conducting liquids.
Question 7
1 / -0

Which of the following statements is/are false?

a. Caustic soda is produced by the electrolysis of an aqueous solution of sodium chloride.
b. If we take distilled water in a beaker and pass electricity through it, then the bulb will not glow at all even if a large battery is applied.
c. A solution of sodium hydroxide or potassium hydroxide in water conducts electricity.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

Caustic soda is produced by the electrolysis of molten sodium chloride. Hence statement a is wrong.
Question 8
1 / -0

Which of the following gases is formed at the anode, connected to the positive terminal of the battery, when electric current is passed through acidified water?

A
Hydrogen

B
Nitrogen

C
Oxygen

D
Argon

Solution

This is the correct option. Oxygen is formed at the anode, connected to the positive terminal of the battery, when electric current is passed through acidified water.
Question 9
1 / -0

When an electric current flows through a conducting solution, it causes a chemical change. The chemical reactions brought about by an electric current will not produce which of the following effects?

a. Change in the colour of the solution may occur.
b. Deposits of metal will be formed on the sides of the glass container.
c. Bubbles of a gas or gases may be formed on the electrodes.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

This is the correct option as the chemical reactions brought about by an electric current will not deposit metal on the sides of the glass container. It may deposit metal on electrodes.

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Chemical Effects of Current Test - 4

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Chemical Effects of Current Test - 4

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Question 1

one of the electrodes is eaten away

electrode potentials of both the electrodes become equal

electrode potentials of both the electrodes go on decreasing

electrode potentials of both the electrodes go on increasing

Solution

Question 2

because rubber is flexible

because rubber is soft

because rubber is an insulator

because rubber melts on heating

Solution

Question 3

outer surface of the bulb does not get heated sufficiently

inner surface of the bulb does not get heated sufficiently

gases (argon or nitrogen) inside the bulb are not heated sufficiently

filament of the bulb does not get heated to a sufficiently high temperature

Solution

Question 4

The solution boils.

The solution produces bubbles and dries up.

The solution dissociates into silver and nitrate ions.

The solution remains unaffected.

Solution

Question 5

Only a

Only a and b

Only b

Only b and c

Solution

Question 6

Only a and b

Only a and c

Only a and d

Only b and c

Solution

Question 7

Only a

Only a and b

Only b

Only b and c

Solution

Question 8

Hydrogen

Nitrogen

Oxygen

Argon

Solution

Question 9

Only a

Only a and b

Only b

Only b and c

Solution

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