Chemical Effects of Current Test

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Chemical Effects of Current Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements about electroplating is incorrect?

A
The article to be electroplated is always placed at the anode.

B
A low current should be passed for a longer period of time.

C
Direct current should be used.

D
The metal to be electroplated has to be periodically replaced.

Solution

Option 1 is incorrect as the article to be electroplated is always placed at the cathode.
Question 2
1 / -0

Which of the following elements would get discharged more readily at the cathode during electrolysis?

A
Pb

B
Ca

C
Ni

D
Al

Solution

The cation of an element lower in the reactivity series (having a greater reduction potential) is discharged at the cathode in preference to cations above it (having a lower reduction potential) in the reactivity series. Lead (Pb) will get discharged in preference to Ca, Ni and Al.
Question 3
1 / -0

Which of the following is not an inert electrode?

A
Pt

B
Au

C
C

D
Al

Solution

Inert electrode is an electrode that serves only as a source or sink for electrons without playing a chemical role in the electrode reaction. Precious metals, mercury and carbon are typically used as inert electrodes. Thus, aluminium is not an inert electrode.
Question 4
1 / -0

Electrical appliances can be run on a battery of dry cells, which provides the potential difference across its terminals.
Which aspect of electric current is being demonstrated by this application?

A
Magnetic effect

B
Chemical effect as chemical energy is being converted to electrical

C
Heating effect

D
Electric current cannot pass through solutions.

E
Chemical effect because here the electric energy is being converted to chemical.

Solution

It is the chemical effect of electric current which is being demonstrated and the chemical energy of a spontaneous redox reaction is being converted into electrical energy.
Question 5
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In an electric heater, current is allowed to flow through the coil. It turns red and is ready to use. Which of the following energy conversions takes place here?

A
Electric energy to chemical energy

B
Electric energy to gravitational energy

C
Electric energy to heat energy

D
Electric energy to potential energy

E
None of these

Solution

Electric energy is converted into heat energy by passing current through the coil for long. This is called the heating effect of electric current.
Question 6
1 / -0

Why is chromium used for electroplating?

(a) It does not corrode.
(b) It is scratch resistant.
(c) It is cheap, easily available and can be electroplated very easily.

A
Only (a)

B
Both (a) and (b)

C
Only (c)

D
Both (b) and (c)

Solution

Chromium does not corrode and is scratch resistant. Chromium is neither cheap nor is it easily available. Electroplating of chromium is a complex and controlled process as the chromium layer tends to peel off.
Question 7
1 / -0

A test lamp does not glow while testing the conductivity of a liquid. What does it imply?

A
It implies that electric current can never pass through liquids.

B
It implies that the liquid is definitely distilled water.

C
It implies that there are no ions in the solution.

D
It implies that the solution in the electric cell is saturated.

Solution

This activity demonstrates that electric current can pass through liquids that contain charge carriers or ions.
The bulb in the circuit will not light up if there are no ions in the solution.
Question 8
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We have distilled water in two plastic bottles labelled as A and B. We add hydrochloric acid to the water in bottle A and caustic soda to the water in bottle B. Which of the following will hold true?

A
The solutions in both the bottles will conduct electricity.

B
Only the solution in bottle A will conduct electricity.

C
Only the solution in bottle B will conduct electricity.

D
The solutions in both the bottles will not conduct electricity.

Solution

The solution in bottle A is acidic and the solution in bottle B is basic. Both acids and bases dissociate into ions in water. So, both the solutions will conduct electricity when an electric current is passed through them.
Question 9
1 / -0

According to Faraday's first law, the amount of substance deposited at electrode when electric current is passed through an electrolyte depends upon the

(a) amount of current passed
(b) dissociation of electrolyte
(c) time till which current is passed
(d) nature of electrode material

A
Both (a) and (b)

B
Both (b) and (c)

C
Both (a) and (c)

D
Both (c) and (d)

Solution

According to Faraday's first law, the amount of substance deposited at the electrodes when electric current is passed through an electrolyte depends upon the amount of electric charge passed, which in turn depends upon the amount of current passed and the time for which it is passed.
Question 10
1 / -0

Electroplating is coating a metal with a layer of another metal. The purpose of the process is:

A
to make the metal more reactive

B
to make the appearance of the metal dull

C
to change the composition of the metal

D
to protect the metal underneath and to improve its looks

Solution

Metallic objects are electroplated to protect the metal underneath form corrosion or to improve its looks and make it attractive.
Question 11
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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

E
None of these

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 12
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

Correct Answer: Because rubber is an insulator
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 13
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 14
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 15
1 / -0

What will be the observation when the following circuit is set up?

A
Solution starts boiling.

B
Solution cools down.

C
Gas bubbles are produced near the electrodes immediately.

D
Gas bubbles are produced near the electrodes after 3-4 minutes.

Solution

Correct Answer: Gas bubbles are produced near the electrodes after 3-4 minutes.
The bubbles formed at the electrodes indicate the gaseous products formed.
On the passage of electric current, the electrolysis of water takes place and hydrogen gas is obtained at the cathode and oxygen gas is obtained at the anode.
Question 16
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

E
Only c

Solution

Vinegar does conduct electricity as it is a solution of acid and all acids are electrolytes and dissociate into ions.
Question 17
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

E
Only b and d

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 18
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

E
Only c

Solution

Caustic soda is produced by the electrolysis of molten sodium chloride. Hence statement a is wrong.
Question 19
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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

E
Helium

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 20
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

E
Only 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 - 6

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Chemical Effects of Current Test - 6

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Question 1

The article to be electroplated is always placed at the anode.

A low current should be passed for a longer period of time.

Direct current should be used.

The metal to be electroplated has to be periodically replaced.

Solution

Question 2

Pb

Ca

Ni

Al

Solution

Question 3

Pt

Au

C

Al

Solution

Question 4

Magnetic effect

Chemical effect as chemical energy is being converted to electrical

Heating effect

Electric current cannot pass through solutions.

Chemical effect because here the electric energy is being converted to chemical.

Solution

Question 5

Electric energy to chemical energy

Electric energy to gravitational energy

Electric energy to heat energy

Electric energy to potential energy

None of these

Solution

Question 6

Only (a)

Both (a) and (b)

Only (c)

Both (b) and (c)

Solution

Question 7

It implies that electric current can never pass through liquids.

It implies that the liquid is definitely distilled water.

It implies that there are no ions in the solution.

It implies that the solution in the electric cell is saturated.

Solution

Question 8

The solutions in both the bottles will conduct electricity.

Only the solution in bottle A will conduct electricity.

Only the solution in bottle B will conduct electricity.

The solutions in both the bottles will not conduct electricity.

Solution

Question 9

Both (a) and (b)

Both (b) and (c)

Both (a) and (c)

Both (c) and (d)

Solution

Question 10

to make the metal more reactive

to make the appearance of the metal dull

to change the composition of the metal

to protect the metal underneath and to improve its looks

Solution

Question 11

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

None of these

Solution

Question 12

because rubber is flexible

because rubber is soft