General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 27

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Question 1
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Name the element which serves as the cathode in the extraction of aluminium.

A
Carbon

B
Graphite rods

C
Iron

D
Aluminium

Solution

$$ Al_2O_3 \rightleftharpoons 2Al^{3+} \ +\ 3O^{2-} $$
At cathode : $$2Al^{3+} + 6e^- \longrightarrow 2Al$$
At anode : $$3O^{2-} \longrightarrow 3O_2 +\ 6e^-$$
Electrolysis of Molten mixture
Cathode : Carbon
Anode : Graphite rods
Electrolyte : 60 parts cryolite + 20 parts fluorspar + 20 parts pure $$Al_2O_3$$
Temperature : 900$$^o$$C.
Question 2
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Assertion: When an electric current is passed through the copper sulphate electrolyte, the impure copper anode gradually dissolve and pure copper is deposited on the cathode.
Reason: Pure metals are deposited in electroplating techniques.

A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion

B
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

C
Assertion is true but Reason is false

D
Assertion is false but Reason is true

E
Both Assertion and Reason are false

Solution

When an electric current is passed through the copper sulphaate electrolyte, the impure copper anode gradually dissolves and pure copper is deposited on the cathode.because of The negative cathode electrode attracts Cu2+ ions (from copper sulfate)
the Electroplating techniques are extensively used for the depositionof pure-metal and alloy thin films
Question 3
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Followed by oxygen which element is the most abundant in human body?

A
C

B
H

C
Ca

D
P

Solution

Followed by oxygen carbon is the most abundant in human body.
It is an essential constituent of the human body.
Question 4
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CO is toxic because it forms complex with _________ in the blood.

A
carbohydrate

B
protein

C
haemoglobin

D
none of these

Solution

Carbon monoxide binds very strongly to the iron in hemoglobin. Once carbon monoxide attaches, it is very difficult to release. While breathing in carbon monoxide, it sticks to your hemoglobin and takes up all of the oxygen-binding sites. Eventually, blood loses all of its ability to transport oxygen and will cause unconsciousness.
Question 5
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$$NaCN$$ is sometimes added in the forth flotation process as a depressant when $$ZnS$$ and $$PbS$$ minerals are expected because :

A
$$Pb(CN)_2$$ is precipitated while no effect as $$ZnS$$

B
$$ZnS$$ forms soluble complex $$Na_2[Zn(CN)_4]$$ while $$PbS$$ forms froth

C
$$PbS$$ forms soluble complex $$Na_2[Pb(CN)_4]$$ while $$ZnS$$ forms froth

D
$$NaCN$$ is never added in froth flotation process

Solution

When the minerals are expected to contain $$PbS$$ and $$ZnS$$, suitable depressants such as $$NaCN$$ are added.
The added $$NaCN$$, selectively prevents $$ZnS$$ from coming to the froth by forming soluble complex $$Na_2[Zn(CN)_4]$$ and $$PbS$$ is removed along with the froth.
Question 6
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Which of the following metals are found in native state?

Ag, Pt, C, Si, N, O, Mg, Na, Pb

A
Ag, Pt, C, N, O

B
Ag, Pt, Mg

C
Ag, Pt, Pb, Mg

D
Ag, Pt

Solution

Ag and Pt are found in native (free) state.
Native silver usually occurs associated with coppr and gold, e.g., in alluvial sands.
Question 7
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A thermite mixture contains iron $$[III]$$ oxide and aluminium, in which ______ is in a higher ratio in the mixture.

A
aluminium

B
iron $$[III]$$ oxide

C
both are equal

D
none of these

Solution

A termite mixture contain aluminium and iron oxide powder together in the ratio $$27:80$$. So, the iron oxide is higher in the ratio.
Question 8
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Copper is an __________ resource.

A
Exhaustible

B
Non-exhaustible

C
Potential

D
National

Solution

Copper is an exhaustible resource.

A inexhaustible resource is like solar power, which keeps on coming no matter how much we use it.

Copper is mined out of the earth. When it is all finished there will be no more.

Option A is correct.
Question 9
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Directions For Questions

Complete the statements given below pertaining to metallurgy by filling
the blank with the correct word.
With reference to the extraction of aluminium.

...view full instructions

The conversion of aluminium hydroxide to pure alumina is carried out by:

A
addition of $$Al(OH)_3$$ crystals

B
thermal decomposition

C
precipitation

D
none of these

Solution

By thermal decomposition as:
$$2NaAlO_2 + CO_2 + 3H_2O \rightarrow 2Al(OH)_3 \downarrow + Na_2CO_3$$
$$2Al(OH)_3 \xrightarrow{1000^o C} Al_2O_3 + 3H_2O$$
Question 10
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Aluminium is utilized in cooking utensils since it is :

A
Good conductor of electricity

B
Bright in appearance

C
Good conductor of heat

D
Tensile

Solution

Al is an active metal so its a good conductor of heat, due to this property it is utilized in cooking utensils.

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General Principles and Processes of Isolation of Elements Test - 27

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General Principles and Processes of Isolation of Elements Test - 27

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Question 1

Carbon

Graphite rods

Iron

Aluminium

Solution

Question 2

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

Assertion is true but Reason is false

Assertion is false but Reason is true

Both Assertion and Reason are false

Solution

Question 3

C

H

Ca

P

Solution

Question 4

carbohydrate

protein

haemoglobin

none of these

Solution

Question 5

$$Pb(CN)_2$$ is precipitated while no effect as $$ZnS$$

$$ZnS$$ forms soluble complex $$Na_2[Zn(CN)_4]$$ while $$PbS$$ forms froth

$$PbS$$ forms soluble complex $$Na_2[Pb(CN)_4]$$ while $$ZnS$$ forms froth

$$NaCN$$ is never added in froth flotation process

Solution

Question 6

Ag, Pt, C, N, O

Ag, Pt, Mg

Ag, Pt, Pb, Mg

Ag, Pt

Solution

Question 7

aluminium

iron $$[III]$$ oxide

both are equal

none of these

Solution

Question 8

Exhaustible

Non-exhaustible

Potential

National

Solution

Question 9

addition of $$Al(OH)_3$$ crystals

thermal decomposition

precipitation

none of these

Solution

Question 10

Good conductor of electricity

Bright in appearance

Good conductor of heat

Tensile

Solution

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