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Test: Isolation of Elements - 2 (Old NCERT) - JEE MCQ


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30 Questions MCQ Test - Test: Isolation of Elements - 2 (Old NCERT)

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Test: Isolation of Elements - 2 (Old NCERT) - Question 1
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Formation of metallic copper from the sulphide ore in the commercial thermo-metallurgical process essentially involves which one of the following reaction :

Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 1

Self reduction process

2Cu2O + Cu2S → 6Cu + SO2

Test: Isolation of Elements - 2 (Old NCERT) - Question 2
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Ag2S + NaCN + Zn →Ag

This method of extraction of Ag by complex formation and then its displacement is called :

Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 2

The process mention is rxn is known as Mc.
Arthur forest Method :

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Test: Isolation of Elements - 2 (Old NCERT) - Question 3
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Calcination is the process of heating the ore :

Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 3

The correct answer is option C.
Calcination is a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition, phase transition, or removal of a volatile fraction.
 

Test: Isolation of Elements - 2 (Old NCERT) - Question 4
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Which of the following does not contain Mg :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 4

The correct answer is option A.
Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe3O4. It does not contain Mg.
Magnesite is a magnesium carbonate mineral with a chemical composition of MgCO3. 
Asbestos is CaMg3(SiO3)4.
Carnallite is an evaporite mineral, a hydrated potassium magnesium chloride with formula KMgCl3⋅6(H2O).

Test: Isolation of Elements - 2 (Old NCERT) - Question 5
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Match the method of concentration of the ore in column I with the ore in column II and select the correct alternate:
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 5

Magnete seperation → FeCr2O4
froath floatation → Ag2S
gravity separation → Al2 (SiO3)2

Test: Isolation of Elements - 2 (Old NCERT) - Question 6
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Bessemerization is carried out for

(I) Fe
(II) Cu
(III) Al
(IV) silver
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 6

Bessermerisatioin process is used for Fe and Cu

Test: Isolation of Elements - 2 (Old NCERT) - Question 7
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Refining of silver is done by :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 7

By cupellation it is urea for the removal of Pb from Ag and Au

Test: Isolation of Elements - 2 (Old NCERT) - Question 8
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Which of the following is not used for obtaining Ag
Test: Isolation of Elements - 2 (Old NCERT) - Question 9
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Blister Cu is about :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 9

Blister copper is 98 % pure Cu

Test: Isolation of Elements - 2 (Old NCERT) - Question 10
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Which one of the following is not a method of concentration of ore?
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 10

S melting is not a process of concn of ore.

Test: Isolation of Elements - 2 (Old NCERT) - Question 11
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In which of the following isolations no reducing agent is required :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 11

Mercury from cinnarbar (HgS)
(Auto reductant and self reduction) (Cu2S, PbS, HgS)

Test: Isolation of Elements - 2 (Old NCERT) - Question 12
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Chemical leaching is useful in the concentration of :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 12

leaching is used for bauxite

Test: Isolation of Elements - 2 (Old NCERT) - Question 13
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The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 13

Aluminium oxide could be extracted by electrolysis phenomenon.

Test: Isolation of Elements - 2 (Old NCERT) - Question 14
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Consider the following statements :

Roasting is carried out to :

(i) convert sulphide to oxide and sulphate (ii) remove water of hydration

(iii) melt the ore (iv) remove arsenic and sulphur impurities

Of these statements :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 14

The correct answer is Option C.
ROASTING 
The removal of the excess sulphur contained in sulphide ores by heating in an excess of air is called roasting. The concentrated sulphide ore is heated in a reverberatory furnace, below its melting point or fusion temperature in the presence of an excess of air with or without the addition of an external substance. 
In roasting definite chemicals like oxidation, chlorination etc. take place but in calcination does not occur any major chemical changes.
 
Advantages of Roasting :
(i) Excess of sulphur is removed as volatile oxide. 
(ii) The metal sulphide is converted into metal oxide and sulphate. 
(iii) Impurities of arsenic and antimony are removed as their volatile oxides.
 

Test: Isolation of Elements - 2 (Old NCERT) - Question 15
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Iron obtained from blast furance is :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 15

Iron obtained from blast furnace is pig iron

Test: Isolation of Elements - 2 (Old NCERT) - Question 16
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Which one of the following statements is not correct :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 16

(A) Malachite Cu(OH)2 . CuCO3
(B) Calamine ZnCO3
(C) Cerussite PbCO3
Stellite is an ore

Test: Isolation of Elements - 2 (Old NCERT) - Question 17
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Which of the following is not an ore :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 17

Some transition metal can form poly nuclear metal carbonyls also.

Test: Isolation of Elements - 2 (Old NCERT) - Question 18
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In the extraction of nickel by Mond process, the metal is obtained by :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 18

Thermal decomposition

Test: Isolation of Elements - 2 (Old NCERT) - Question 19
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B4C(boron carbide) is used except:
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 19

The correct answer is Option D.
Boron carbide B4C is not used for making diborane.
It is used in the extraction of boron, as an abrasive for polishing and for making bullet proof clothing.
 

Test: Isolation of Elements - 2 (Old NCERT) - Question 20
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Froath floatation process is based on:
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 20

The correct is Option A.

Froth flotation is a process of  concentration. Froth floatation process is suitable for sulphide ores. It is based on the difference in wetting properties of the ore and gangue with water and oil. This method is used for the concentration of FeCr2O4 

Test: Isolation of Elements - 2 (Old NCERT) - Question 21
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When ZnS and PbS minerals are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 21

PbS + NaCN/KCN → No. reaction
ZnS + NaCN/KCN → [Zn(CN)4]2– + S2– + 4Na+/ 4K+

Test: Isolation of Elements - 2 (Old NCERT) - Question 22
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When copper is purified by electrorefining process, noble metals like Ag and Au are found in
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 22

Cu and Ag are found in anode mud.

Test: Isolation of Elements - 2 (Old NCERT) - Question 23
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Formation of Ni(CO)4 and subsequent its decomposition into Ni and CO (recycled) makes basis of Mond's process

Ni + 4CO  Ni (CO)4   Ni + 4CO

T1 and T2 are :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 23

Ni + 4CO  Ni (CO)4   Ni + 4CO
T1 = 50ºC
T2 = 230ºC

Test: Isolation of Elements - 2 (Old NCERT) - Question 24
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Match column–I (process) with column–II (electrolyte) :

Choose the correct alternate.
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 24

Down cell → Fused (40 % NaCl + 60 % CaCl2)
Dow seawater process → fused NaCl2
Hall-heroult ⇒ fused (Al2O3 + Na3AlF6 + CaF2)
Moissan → Fused KHF2

Test: Isolation of Elements - 2 (Old NCERT) - Question 25
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(I) FeCr2O4 + NaOH + air → (A) + Fe2O3

(II) (A) + (B) → Na2Cr2O7

(III) Na2Cr2O7 + X  Cr2O3

(IV) Cr2O3 + Y  Cr

Q.

Compounds (A) and (B) are :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 25

A → Na2CrO4
B → H2SO4

Test: Isolation of Elements - 2 (Old NCERT) - Question 26
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(I) FeCr2O4 + NaOH + air → (A) + Fe2O3

(II) (A) + (B) → Na2Cr2O7

(III) Na2Cr2O7 + X  Cr2O3

(IV) Cr2O3 + Y  Cr

Q.

(X) and (Y) are :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 26

X → CO
Y → Al

Test: Isolation of Elements - 2 (Old NCERT) - Question 27
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(I) FeCr2O4 + NaOH + air → (A) + Fe2O3

(II) (A) + (B) → Na2Cr2O7

(III) Na2Cr2O7 + X  Cr2O3

(IV) Cr2O3 + Y  Cr

Q.

Na2CrO4 and Fe2O3 are separated by :
Test: Isolation of Elements - 2 (Old NCERT) - Question 28
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(I) FeCr2O4 + NaOH + air → (A) + Fe2O3

(II) (A) + (B) → Na2Cr2O7

(III) Na2Cr2O7 + X  Cr2O3

(IV) Cr2O3 + Y  Cr

Q.

High temperature (> 1000ºC) electrolytic reduction is necessary for isolating :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 28

The correct answer is option A.
Chromite ore is heated with sodium hydroxide in air to obtain sodium chromate. It is then heated with carbon to obtain chromium trioxide. It is then heated with aluminum to form chromium. This is reduction of chromium trioxide to chromium.

Test: Isolation of Elements - 2 (Old NCERT) - Question 29
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In froth-floatation process, palm oil functions as :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 29

Palm oil function as frother. It decreases the surface tension of the total solution, by which the formation of froth becomes easier.

Test: Isolation of Elements - 2 (Old NCERT) - Question 30
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Collector are the substances which help in attachement of an ore particle to air bubble in froth. A popular collector used industrially is :
Detailed Solution for Test: Isolation of Elements - 2 (Old NCERT) - Question 30

The correct answer is option A.
Sodium ethyl xanthate is used as a collector in the froth floatation process.
Froth floatation process used for the concentration of sulphide ore uses sodium ethyl xanthate, C2H5OCS2Na as collector.
Other examples of collector include ethyl xanthate and potassium ethyl xanthate. They attach themselves to the grains of minerals by polar groups so that minerals become water repellent and pass on into the froth.

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