Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 11

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Question 1
1 / -0

Boojhos uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

A
in the nearby river.

B
in the nearby pond.

C
in the nearby cornfield.

D
according to the disposal guidelines of the local authority.

Solution

Electroplating waste are hazardous in nature, therefore it must be disposed of according to the authority.
Question 2
1 / -0

One of the most common applications of chemical effect of electric current is ______________.

A
electroplating

B
chemical etching

C
electric shielding

D
none of these.

Solution

The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. It is one of the most common applications of chemical effects of electric current. exp: Chromium coating, Gold plating etc.
Question 3
1 / -0

Electroplating does not help

A
fine finish to the surface

B
shining appearance

C
metals to become hard

D
protect metals against corrosion

Solution

Electroplating is primarily used to change the surface properties of an object like appearance, corrosion protection, lubricity etc. Electroplating only adds a thin coating of metal on the surface whose purpose is to prevent corrosion, or give better lustre and appearance. Thus, electroplating does not help the metals to become harder.
Question 4
1 / -0

Which of the following substance upon dissolving a small amount in pure water, the resultant solution starts conducting electricity?

A
NaCl

B
sugar

C
kerosene

D
oxygen

Solution

Answer is A.
The water that we get from sources such as taps, hand pumps, wells and ponds is not pure. It may contain several salts dissolved in it. Small amounts of mineral salts are naturally present in it. This water is thus a good conductor of electricity. On the other hand, pure water is free of salts and is a poor conductor. So, when $$NaCl$$ is added the salt dissociates into its ions which make this water conductive.
When this pure water is mixed with NaCl (common salt), it conducts electricity.
Question 5
1 / -0

The process of depositing a layer of any desired metal on another material by means of electricity is called __________.

A
$$electrothreading$$

B
$$electrofocussing$$

C
$$electroplating$$

D
None of these

Solution

The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating.
Electroplating is a very useful process. It is widely used in industry for coating metal objects with a thin layer of a different metal. The layer of metal deposited has some desired property, which the metal of the object lacks. For example, chromium plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others.
Question 6
1 / -0

A coating of zinc is deposited on iron to protect it from __________.

A
rain

B
corrosion

C
sun

D
none of these
Solution
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.

Galvanizing protects in two ways:
- it forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal.
- the zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
Hence, A coating of zinc is deposited on iron to protect it from corrosion and formation of rust.
Question 7
1 / -0

_________ plating is done on objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims because of its shiny appearance

A
Chromium

B
Nickel

C
Carbon

D
None of these

Solution

Chromium plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others.Electroplating is one of the most common applications of chemical effects of electric current.The main advantage of chromium plating is chromium has a shinyappearance. It does not corrode. It resists scratches.
Question 8
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Chromium has a shiny appearance and lt does not corrode

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

Answer is A.
Electroplating is a very useful process. It is widely used in industry for coating metal objects with a thin layer of a different metal. The layer of metal deposited has some desired property, which the metal of the object lacks. For example, chromium plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others.
Chromium has a shiny appearance. It does not corrode. It resists scratches. However, chromium is expensive and it may not be economical to make the whole object out of chromium. So the object is made from a cheaper metal and only a coating of chromium over it is deposited.
Hence, electroplating of chromium is done on objects like water taps and cycle bell to give them a shiny appearance and prevent them from corrosion. The statement is true.
Question 9
1 / -0

When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

A
the chemical effect of current.

B
the heating effect of current.

C
the magnetic effect of current.

D
the lightning effect of current.

Solution

The passage of an electric current through a conducting solution causes chemical reactions. This results in change of colour of the solution. Hence, this indicates the chemical effect of electric current.
Question 10
1 / -0

Electroplating is a very useful process widely used in industry for coating metal objects with a thin layer of :

A
Metals

B
Non-metals

C
Alloy

D
Salts

Solution

Electroplating is a process that adds a surface layer of metal to another type of metal by electrolysis. It is used to prevent corrosion of metals.

Hence, the correct option is A.

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Chemical Effects of Electric Current Test - 11

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Question 1

in the nearby river.

in the nearby pond.

in the nearby cornfield.

according to the disposal guidelines of the local authority.

Solution

Question 2

electroplating

chemical etching

electric shielding

none of these.

Solution

Question 3

fine finish to the surface

shining appearance

metals to become hard

protect metals against corrosion

Solution

Question 4

NaCl

sugar

kerosene

oxygen

Solution

Question 5

$$electrothreading$$

$$electrofocussing$$

$$electroplating$$

None of these

Solution

Question 6

rain

corrosion

sun

none of these

Solution

Question 7

Chromium

Nickel

Carbon

None of these

Solution

Question 8

True

False

Ambiguous

Data insufficient

Solution

Question 9

the chemical effect of current.

the heating effect of current.

the magnetic effect of current.

the lightning effect of current.

Solution

Question 10

Metals

Non-metals

Alloy

Salts

Solution

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