Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 4

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Question 1
1 / -0

Pure or distilled water is a/an

A
conductor

B
insulator

C
partial conductor

D
None of these

Solution

Pure or distilled water is an insulator as it does not contain any salts or ions for the conduction of electricity.
Question 2
1 / -0

Which of the following liquids is a conductor of electricity?

A
Kerosene

B
Cooking oil

C
Alcohol

D
Vinegar

Solution

Some liquids, such as oil and alcohol, do not dissociate into ions and hence, they do not conduct electricity, whereas vinegar contains acetic acid dissolved in water. It separates into ions, and thus vinegar conducts electricity.
Question 3
1 / -0

Adding a soluble metallic salt to water

A
increases its electrical conductivity

B
decreases its electrical conductivity

C
never causes any change in its conductivity

D
None of these

Solution

When we add metallic salt to water, it dissociates into ions. Hence, water conducts electricity.
Question 4
1 / -0

Directions: In this question, two statements are given labelled as A and B. Read both the statements and select the correct option accordingly.

Statement A: We prefer LED over bulb in testing the electrical conductivity of liquids.
Statement B: LED is used in place of bulb, which works on heating effect of current, because LED glows even when weak electric current flows in the circuit.

A
Both A and B are correct and B is the correct explanation for A.

B
Both A and B are correct, but B is not the correct explanation for A.

C
A is incorrect, but B is correct.

D
Both A and B are incorrect.

Solution

An LED bulb is a device which works on very small current and hence, it can be used to detect small currents. So, both A and B are correct and B is the correct explanation for A.
Question 5
1 / -0

A tester is used to check the conductivity of liquids A and B. It is found that the tester glows brightly in case of liquid A, and dimmer in case of liquid B. This implies that

A
liquid B is a better conductor than liquid A

B
liquid A is a better conductor than liquid B

C
both liquids A and B have the same conductivity

D
we cannot determine the conductivity with a tester

Solution

The brightness of the bulb depends upon the current passing through the bulb. Greater the current, greater would be the brightness of the bulb. It means that if the tester glows brightly in case of liquid A and dimmer in case of liquid B, then liquid A is a better conductor than liquid B.
Question 6
1 / -0

During electroplating, the pure metal is deposited at

A
the cathode

B
the anode

C
both the cathode and the anode

D
the bottom of the electrolytic cell

Solution

The process of depositing a thin layer of a desired metal over a metal object with the help of electric current is called electroplating.
The metal object on which electroplating is to be done is made the negative electrode. It is connected to the negative terminal (cathode) of the battery.
The metal whose layer is to be deposited is made the positive electrode. It is connected to the positive terminal (anode) of the battery.
A water-soluble salt of the metal to be deposited is taken as the electrolyte.
Question 7
1 / -0

In the process of purification of copper metal, a thin plate of pure copper and a thick rod of impure copper are used as electrodes, and a metal salt solution is used as the electrolyte.

Which electrode is connected to the positive terminal of the battery?

A
Thin rod of pure copper

B
Thick rod of impure copper

C
Either (1) or (2)

D
Neither (1) nor (2)

Solution

During the purification of copper metal, a thick rod of impure copper metal is made the positive electrode or anode, i.e. it is connected to positive terminal of the battery. A thin strip of pure copper is made the negative electrode or cathode, i.e. it is connected to the negative terminal of the battery. Copper sulphate (CuSO₄) can be taken as the electrolyte. On passing electric current, the copper dissolves from the impure anode into the electrolyte solution. The copper present in dissolved form in electrolyte gets deposited on the cathode in the pure form. The impurities are left behind in the electrolyte solution.
Question 8
1 / -0

Pick the incorrect statement(s) from the following:

(A) The sugar solution is an electrolyte.
(B) Cations are negatively charged particles.
(C) Electrolytes produce ions when dissolved in water.
(D) A cycle rim is made of iron that is electroplated with chromium.

A
Only (A)

B
Only (B)

C
Only (A) and (B)

D
Only (C) and (D)

Solution

Sugar solution does not dissociate into ions, so it is not an electrolyte.
Question 9
1 / -0

In electrolysis, the amount of mass deposited or liberated at an electrode is _____ the amount of charge passed through the electrolyte.

A
inversely proportional to

B
directly proportional to

C
independent of

D
None of the above

Solution

According to Faraday's law, 'The amount of mass deposited or liberated at an electrode is directly proportional to the amount of charge passed through the electrolyte.'
Question 10
1 / -0

In a dry cell, leaking occurs because

A
zinc electrode has dissolved away

B
carbon electrode has dissolved away

C
manganese oxide has been used up

D
polarisation cannot be prevented at carbon electrode

Solution

In a Zinc-Carbon cell, zinc reacts with ammonium chloride and zinc chloride is formed. The zinc container becomes thinner as the cell is used because zinc metal is oxidised to zinc ions. When the zinc case becomes thin enough, zinc chloride begins to leak out of the battery.
Question 11
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A major drawback of the primary cell is that

A
the electrolyte is very costly

B
the chemical reaction is reversible

C
the chemical reaction is not reversible

D
it is not portable

Solution

A major drawback of the dry cell is that chemical reaction is not reversible. Hence, some time later, chemical reaction stops after which the potential difference between the electrodes starts decreasing and the cell becomes dead.
Question 12
1 / -0

During the charging process, the relative density of the electrolyte

A
increases

B
decreases

C
remains the same

D
first increases and then decreases

Solution

During the charging process, the relative density of H₂SO₄ increases and also the voltage across the terminals increases.
Question 13
1 / -0

The active materials on the positive and negative plates, respectively, of a fully charged lead-acid battery are

A
lead and lead peroxide

B
lead sulphate and lead

C
lead peroxide and lead

D
None of these

Solution

At the positive terminal, lead peroxide is the active material, whereas spongy lead is the active material at the negative terminal.
Question 14
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 15
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 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 16
1 / -0

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 17
1 / -0

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 18
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 19
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 20
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.

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Chemical Effects of Electric Current Test - 4

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Chemical Effects of Electric Current Test - 4

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Question 1

conductor

insulator

partial conductor

None of these

Solution

Question 2

Kerosene

Cooking oil

Alcohol

Vinegar

Solution

Question 3

increases its electrical conductivity

decreases its electrical conductivity

never causes any change in its conductivity

None of these

Solution

Question 4

Both A and B are correct and B is the correct explanation for A.

Both A and B are correct, but B is not the correct explanation for A.

A is incorrect, but B is correct.

Both A and B are incorrect.

Solution

Question 5

liquid B is a better conductor than liquid A

liquid A is a better conductor than liquid B

both liquids A and B have the same conductivity

we cannot determine the conductivity with a tester

Solution

Question 6

the cathode

the anode

both the cathode and the anode

the bottom of the electrolytic cell

Solution

Question 7

Thin rod of pure copper

Thick rod of impure copper

Either (1) or (2)

Neither (1) nor (2)

Solution

Question 8

Only (A)

Only (B)

Only (A) and (B)

Only (C) and (D)

Solution

Question 9

inversely proportional to

directly proportional to

independent of

None of the above

Solution

Question 10

zinc electrode has dissolved away

carbon electrode has dissolved away

manganese oxide has been used up

polarisation cannot be prevented at carbon electrode

Solution

Question 11

the electrolyte is very costly

the chemical reaction is reversible

the chemical reaction is not reversible

it is not portable

Solution

Question 12

increases

decreases

remains the same

first increases and then decreases

Solution