Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The electrolyte in the Leclanche`s cell is a moist paste of ammonium chloride, containing _____ chloride in a ____ cup.

A
zinc, porous

B
magnesium, steel

C
tin, nickel

D
copper, iron

Solution

The electrolyte in the Leclanche`s cell is a moist paste of ammonium chloride, containing zinc chloride in a porous cup. Leclanche's cell consists of a glass vessel containing a strong solution of ammonium chloride. The amalgamated zinc rod dipped in ammonium chloride solution acts as a negative electrode. The positive electrode is a carbon rod placed inside a porous pot, and the empty space in the porous pot is filled with manganese dioxide and charcoal powder.
Question 2
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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 used for a long time.

C
A direct current should be used.

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

Solution

The article to be electroplated is always placed at the cathode. So, the first statement is incorrect.
Question 3
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Which among the following is a non-electrolyte?

A
PbBr₂

B
CuSO₄

C
H₃PO₄

D
CS₂

Solution

CS₂ is a non-electrolyte because it does not form ions in aqueous solution.
Question 4
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Which of the following statements is/are true?

(a) The passage of electric current through a conducting solution can cause a chemical reaction to take place.
(b) The passage of electric current through a conducting solution can cause a physical reaction.

A
Only (a)

B
Only (b)

C
Both (a) and (b)

D
Neither (a) nor (b)

Solution

The passage of electric current through a conducting solution can cause physical as well as chemical changes. Chemical changes are more obvious because they are easier to detect. However, the passage of current also heats up the liquid, which is a physical phenomenon.
Question 5
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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 6
1 / -0

Why are cans, used for storing food, made of electroplated tin instead of iron?

A
Tin is more reactive than iron.

B
Tin is less reactive than iron.

C
Tin reacts with food to prevent spoiling.

D
Tin absorbs oxygen from the air, thereby preventing oxidation of food.

Solution

Tin is less reactive than iron and does not react with the food.
Question 7
1 / -0

Which of the following statements is true for the purification of copper?

A
A pure copper rod is connected to the positive terminal of the battery and copper sulphate solution is the electrolyte.

B
A pure copper rod is connected to the positive terminal of the battery and distilled water is the electrolyte.

C
An impure copper rod is connected to the positive terminal of the battery and salty water is the electrolyte.

D
An impure copper rod is connected to the positive terminal of the battery and copper sulphate solution is the electrolyte.

Solution

In the purification of copper, an impure copper rod is connected to the positive terminal, pure copper rod is connected to the negative terminal and an aqueous solution of a copper salt, usually copper sulphate, is used as the electrolyte.
Question 8
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 9
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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 10
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 11
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What serves as the cathode in a common dry cell?

A
Carbon electrode

B
Zinc container

C
Steel cover

D
Nickle terminal

Solution

In a common dry cell, carbon rod acts as the positive terminal (anode) and zinc container acts as the negative terminal (cathode).
Question 12
1 / -0

Electricity is produced in a dry cell from

A
nuclear energy

B
mechanical energy

C
chemical energy

D
thermal energy

Solution

Dry cells are a type of chemical cells. Dry cells are commonly used today in the form of batteries in many electrical appliances.
Question 13
1 / -0

Choose the incorrect statement(s) from the following:

(A) Ammonium chloride is used as the electrolyte in a dry cell.
(B) Manganese dioxide is used as a depolariser.
(C) Zinc chloride can be used as an electrolyte.
(D) Sodium chloride can also be used as a depolariser.

A
Only (A)

B
Only (A) and (B)

C
Only (B) and (C)

D
Only (C) and (D)

Solution

In a dry cell, ammonium chloride is used as the electrolyte and manganese dioxide is used as a depolariser. Zinc chloride is formed during the reaction of Zn ions with ammonium chloride. Sodium chloride is an ordinary salt and it is not used as a depolariser.
Question 14
1 / -0

During the charging of a lead-acid battery, the density of sulphuric acid

A
increases

B
decreases

C
remains the same

D
becomes zero

Solution

During the charging of a lead-acid battery, there is formation of sulphuric acid. So, the density of sulphuric acid increases.
Question 15
1 / -0

Choose the incorrect statement:

During the discharging of a lead-acid battery,

A
both anode and cathode become PbSO₄

B
specific gravity of H₂SO₄ decreases

C
voltage of the cell decreases

D
the cell absorbs energy

Solution

During the discharging of a lead acid battery, chemical energy is converted into electrical energy. So, the battery loses energy.

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Chemical Effects of Electric Current Test - 5

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Chemical Effects of Electric Current Test - 5

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Question 1

zinc, porous

magnesium, steel

tin, nickel

copper, iron

Solution

Question 2

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

A low current should be used for a long time.

A direct current should be used.

The metal to be coated has to be periodically replaced.

Solution

Question 3

PbBr2

CuSO4

H3PO4

CS2

Solution

Question 4

Only (a)

Only (b)

Both (a) and (b)

Neither (a) nor (b)

Solution

Question 5

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 6

Tin is more reactive than iron.

Tin is less reactive than iron.

Tin reacts with food to prevent spoiling.

Tin absorbs oxygen from the air, thereby preventing oxidation of food.

Solution

Question 7

A pure copper rod is connected to the positive terminal of the battery and copper sulphate solution is the electrolyte.

A pure copper rod is connected to the positive terminal of the battery and distilled water is the electrolyte.

An impure copper rod is connected to the positive terminal of the battery and salty water is the electrolyte.

An impure copper rod is connected to the positive terminal of the battery and copper sulphate solution is the electrolyte.

Solution

Question 8

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 9

Hydrogen

Nitrogen

Oxygen

Argon

Helium

Solution

Question 10

The solution boils.

The solution produces bubbles and dries up.

The solution dissociates into silver and nitrate ions.

The solution remains unaffected.

Solution

Question 11

Carbon electrode

Zinc container

Steel cover

Nickle terminal

Solution

Question 12

nuclear energy

mechanical energy

chemical energy

thermal energy

PbBr₂

CuSO₄

H₃PO₄

CS₂

both anode and cathode become PbSO₄

specific gravity of H₂SO₄ decreases