Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 2

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Question 1
1 / -0

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 2
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 3
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 4
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 5
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.
Question 6
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 7
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 8
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 9
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 10
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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Re-Attempt Weekly Quiz Competition

Chemical Effects of Electric Current Test - 2

Result

Chemical Effects of Electric Current Test - 2

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SHARING IS CARING

Question 1

the electrolyte is very costly

the chemical reaction is reversible

the chemical reaction is not reversible

it is not portable

Solution

Question 2

increases

decreases

remains the same

first increases and then decreases

Solution

Question 3

lead and lead peroxide

lead sulphate and lead

lead peroxide and lead

None of these

Solution

Question 4

zinc, porous

magnesium, steel

tin, nickel

copper, iron

Solution

Question 5

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 6

Only (a)

Only (b)

Both (a) and (b)

Neither (a) nor (b)

Solution

Question 7

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 8

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 9

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 10

Only (A)

Only (A) and (B)

Only (B) and (C)

Only (C) and (D)

Solution

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