Chemical Effects of Current Test

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Chemical Effects of Current Test - 3

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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
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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
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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
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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.

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

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
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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
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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
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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
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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.

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Chemical Effects of Current Test - 3

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Chemical Effects of Current Test - 3

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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.

Solution

Question 5

Electric energy to chemical energy

Electric energy to gravitational energy

Electric energy to heat energy

Electric energy to potential energy

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

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