General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

The extraction of metal from the ore is:

A
an oxidation process

B
a reduction process

C
a hydration process

D
a neutralisation process

Solution

Extraction of metal from the ore is a reduction process as in this process, metal ion gets reduced to metals.

Extraction of iron from ore haematite:
$3 Fe_2O_3 + CO \rightarrow 2 Fe_3O_4 + CO_2$

$Fe_3O_4 + CO \rightarrow 3Fe + 4 CO_2$
+3, +2 0

Option B is correct

Question 2

1 / -0

Match Column 1 with Column 2:

Column 1	Column 2
A. Mond's process	$1.\ Cr_{2}O_{3}+2Al\xrightarrow{\triangle}2Cr+Al_{2}O_{3}$
B. van Arkel process	$2.\ TiCl_{4}+2Mg \xrightarrow{\triangle}Ti+2MgCl_{2}$
C. Thermite process	$3.\ Ni(CO)_{4} \xrightarrow{\triangle}Ni+4CO$
D. Kroll's process	$4.\ ZrI_{4} \xrightarrow{\triangle}Zr+2I_{2}$

A - 1; B - 2; C - 3; D - 4

A - 2; B - 4; C - 3; D - 1

A - 3; B - 2; C - 1; D - 4

A - 3; B - 4; C - 1; D - 2

Solution

A :

Mond Process is used for purifying Nickel.

Ni+4CO\overset{300K}{\rightarrow}Ni(CO)_{4}\overset{450K}{\rightarrow}Ni+4CO

B :

Van Arkel Method is used for obtaining ultra-pure metals Ti, Zr, etc.

Impure Metal +

I_{2}{\rightarrow}

Metal Iodide

\xrightarrow{Heat}

Pure Metal +

I_{2}

C :

Thermite process is used for refining chromium.

Cr_{2}O_{3}+2Al\overset{\Delta }{\rightarrow}2Cr+Al_{2}O_{3}

D :

Kroll method is also used for Titanium refining.

TiCl_{4}+2Mg\overset{\Delta }{\rightarrow}Ti+2MgCl_{2}

Question 3
1 / -0

Generally sulphide ores are concentrated by which of the following process?

A
Hand picking

B
Washing with water

C
Leaching

D
Froth floatation

Solution

Froth floatation method is based on the principle of the difference in the wetting properties of the ore and the gangue particles with the water and oil. This method is used for that metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores preferably wetted by the oil and the gangue settled down with the water at the bottom of the tank.

Hence, this method is suitable for the concentration of sulphide ore. Galena and Zinc-Blende ores are concentrated by this method.
Question 4
1 / -0

Natron is a mineral whose formula represented by:

A
$Na_{2}CO_{3}.H_{2}O$

B
$Na_{2}CO_{3}.10H_{2}O$

C
$Na_{2}SO_{4}.H_{2}O$

D
$Na_{2}SO_{4}.7H_{2}O$

Solution

Natron is a mixture of sodium carbonate decahydrate and 17% sodium bicarbonate. Small quantities of sodium chloride and sodium sulfate are also present.

$Na_{2}CO_{3}.10H_{2}O$ is the formula for Natron.

Option B is correct.
Question 5
1 / -0

The collecting agent in froth floatation process is:

A
sodium ethyl xanthate

B
pine oil

C
lime

D
water

Solution

Collectors either chemically bond (chemisorption) on a hydrophobic mineral surface, or adsorb onto the surface through physisorption. Collectors increase the natural hydrophobicity of the surface, increasing the separability of the hydrophobic and hydrophilic particles. The collecting agent in froth floatation process is sodium ethyl xanthate.

Pine oil is also added in froth floatation but as frother.

Hence, the correct option is $\text{A}.$
Question 6
1 / -0

Liquation process is used for the concentration of which ore?

A
Stibinite

B
Tinstone

C
Limestone

D
Haematite

Solution

Stibnite (antimonite) is a sulfide mineral with the formula $Sb_2S_3$ . It is concentrated by liquation process.

It was formerly used for extracting antimony minerals from ore.

Separating silver from copper with the use of lead as a solvent, and refining tin.

Option A is correct.
Question 7
1 / -0

Carbon cannot be used to reduce :

A
$ZnO$

B
$SnO_{2}$

C
$Fe_{2}O_{3}$

D
$Al_{2}O_{3}$

Solution

Carbon is used to reduce $ZnO$ , $Fe_2O_3$ and $SnO_2$ above a certain temperature but it is not used for alumina as carbon lies above aluminium in Ellingham diagram.
Question 8
1 / -0

Which one of the following is used in the extraction of aluminium by electrolytic process?

A
$Al_{2}O_{3}$

B
$Al(OH)_{3}$

C
$AlCl_{3}$

D
$Al_{2}(SO_{4})_{3}$

Solution

In the metallurgy of aluminium, purified $Al_2O_3$ is mixed with $Na_3AlF_6$ or $CaF_2$ which lowers the melting point of the mix and brings conductivity.

$2Al_2O_3 + 3C → 4Al + 3CO$

This process of electrolysis is widely known as Hall-Heroult process.

Option A is correct.
Question 9
1 / -0

Liquation method is used to refine which of the following crude metal?

A
Silver

B
Lead

C
Mercury

D
Copper

Solution

Liquation process is used for the purification of the metal, which itself is readily fusible, but the impurities present in it are not, used for the purification of Sn and Zn, and for removing Pb from Zn-Ag alloy.
Question 10
1 / -0

The metal obtained in the Pidgeon process is:

A
$Na$

B
$Mg$

C
$Ca$

D
$Al$

Solution

The Pidgeon process is one of the methods of magnesium metal production via a silicothermic reaction.

$Si(s) + 2MgO(s) \rightarrow SiO_2(s) + 2Mg(g)$

Option B is correct.

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General Principles and Processes of Isolation of Elements Test - 17

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General Principles and Processes of Isolation of Elements Test - 17

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Question 1

an oxidation process

a reduction process

a hydration process

a neutralisation process

Solution

Question 2

A - 1; B - 2; C - 3; D - 4

A - 2; B - 4; C - 3; D - 1

A - 3; B - 2; C - 1; D - 4

A - 3; B - 4; C - 1; D - 2

Solution

Question 3

Hand picking

Washing with water

Leaching

Froth floatation

Solution

Question 4

Na2CO3.H2ONa_{2}CO_{3}.H_{2}ONa2​CO3​.H2​O

Na2CO3.10H2ONa_{2}CO_{3}.10H_{2}ONa2​CO3​.10H2​O

Na2SO4.H2ONa_{2}SO_{4}.H_{2}ONa2​SO4​.H2​O

Na2SO4.7H2ONa_{2}SO_{4}.7H_{2}ONa2​SO4​.7H2​O

Solution

Question 5

sodium ethyl xanthate

pine oil

lime

water

Solution

Question 6

Stibinite

Tinstone

Limestone

Haematite

Solution

Question 7

ZnOZnOZnO

SnO2SnO_{2}SnO2​

Fe2O3Fe_{2}O_{3}Fe2​O3​

Al2O3Al_{2}O_{3}Al2​O3​

Solution

Question 8

Al2O3Al_{2}O_{3}Al2​O3​

Al(OH)3Al(OH)_{3}Al(OH)3​

AlCl3AlCl_{3}AlCl3​

Al2(SO4)3Al_{2}(SO_{4})_{3}Al2​(SO4​)3​

Solution

Question 9

Silver

Lead

Mercury

Copper

Solution

Question 10

NaNaNa

MgMgMg

CaCaCa

AlAlAl

Solution

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$Na_{2}CO_{3}.H_{2}O$

$Na_{2}CO_{3}.10H_{2}O$

$Na_{2}SO_{4}.H_{2}O$

$Na_{2}SO_{4}.7H_{2}O$

$ZnO$

$SnO_{2}$

$Fe_{2}O_{3}$

$Al_{2}O_{3}$

$Al_{2}O_{3}$

$Al(OH)_{3}$

$AlCl_{3}$

$Al_{2}(SO_{4})_{3}$

$Na$

$Mg$

$Ca$

$Al$