Metallurgy

Question 1

Haemoglobin:Fe then Insulin: _______ & Vit.B-12:____ & Chlorophyll:__.

Answer 1

Insulin:Zn
Vit.B-12:Co
Chlorophyll:Mg

Question 2

Iron ores?

Answer 2

Haematite 
Magnetite
Siderite
Chromite
Iron pyrite

Question 3

Copper ores?

Answer 3

Cuprite
Malachite 
Azurite
Copper glance
Copper pyrite

Question 4

Aluminium ores?

Answer 4

Bauxite
Cryolite
Kaolinite/china clay
Corrundum

Question 5

Lead ores ?

Answer 5

Galena
Cerussite
Anglesite

Question 6

Zinc ores ?

Answer 6

Sphaterite/ zinc blende
Calamine
Anglesite

Question 7

Silver ores ?

Answer 7

Argentite/silver glance

Horn silver

Question 8

Tin ore?

Answer 8

Casserite

Question 9

Whats gangue & flux?

Answer 9

Gangue/matrix = impurities of sand,stone particles,silica in mineral.

Flux= substances used to remove impurity(gangue).

Question 10

Low fusible substance is c/d

Answer 10

Slag

Question 11

Homogeneous mixture of 2 or more metals is c/d

Answer 11

Alloy

Question 12

For metals having low SRP (s-block elements, Al) which type of metallurgy is opted

Answer 12

Electro metallurgy.

Question 13

In pyrometallurgy, metals are extracted by

Answer 13

heating.

Question 14

In hydro metallurgy, metal is extracted by

Answer 14

Dissolving in a suitable solvent.

Question 15

Pulverisation means

Answer 15

Crushing/grinding. Large lumps of ore are converted into small pieces using ball mill/crusher.

Question 16

Gravity separation is used for separation of

Answer 16

Oxide ores like Fe2O3, Fe3O4, Cu2O, SnO2

Carbonate ores like FeCO3, ZnCO3

Question 17

Magnetic separation is used for separation of

Answer 17

Magnetic ores like magnetite (Fe3O4), pyrolusite(MnO2), chromite (FeCr2O4).

Question 18

Froth floatation is used for separation of

Answer 18

Sulphide ores except Argentite (Ag2S).

Question 19

Which method is based on adsorption phenomenon?

Answer 19

Froth floatation.

Question 20

In froth floatation, frother used is

Answer 20

Pine oil

Eucalyptus oil

Question 21

In froth floatation, collector used is

Answer 21

Sodium ethyl xanthate.

Question 22

In froth floatation, froth stabiliser used is

Answer 22

Cresol or anniline.

Question 23

Beyer’s process is for

Answer 23

Red bauxite (Fe impurity)

Question 24

Serpeck’s method is used in extraction of

Answer 24

Al from white bauxite (silicon impurity).

Question 25

Calcination is

Answer 25

Heating ore in absence of O2 below its melting point.

Question 26

Roasting is

Answer 26

Heating of ore in presence of O2 below its melting point.

Question 27

Roasting: sulphide ores :: calcination:

Answer 27

Calcination: hydroxides/carbonates/hydrated ores

Question 28

SnO2, an oxide ore is ______ roasted/calcinated.

Answer 28

Roasted (bcz it contains significant amount of S-impurity).

Question 29

Industries that extract metal from sulphide ores also produce

Answer 29

H2SO4.

Bcz raw material i.e SO2 for preparation of sulphuric acid is produced by roasting of sulphide ores.

Question 30

Give molecular formula of haematite

Answer 30

Fe2O3

Question 31

Give molecular formula of magnetite

Answer 31

Fe3O4

Question 32

Give molecular formula of siderite

Answer 32

FeCO3

Question 33

Give molecular formula of chromite

Answer 33

FeCr2O4

Question 34

Iron pyrite is a sulphide ore with formula

Answer 34

FeS2

Question 35

Formula of malachite & azurite

Answer 35

Malachite = CuCO3.Cu(OH)2
Azurite = 2CuCO3.Cu(OH)2

Question 36

Copper pyrite is

Answer 36

CuFeS2

Question 37

Cuprite is

Answer 37

Cu2O

Question 38

Bauxite

Answer 38

Al2O3.H2O

Question 39

Formula of cryolite

Answer 39

Na3AlF6

Question 40

Kaolinite an ore of Aluminium has formula

Answer 40

Al2O3.SiO2.2H2O

Question 41

Galena, cerussite, anglesite have formula

Answer 41

Galena = PbS
Cerussite = PbCO3
Anglesite = PbSO4

Question 42

Formula of zinc blende, calamine, zincite is

Answer 42

Zinc blende = ZnS
Calamine = ZnCO3
Zincite = ZnO

Question 43

Argentite/ silver glance =

Answer 43

Ag2S

Horn silver = AgCl

Question 44

Cassiterite is

Answer 44

Tin ore with formula SnO2

Question 45

Hydro metallurgy is adopted for reduction of ores of ____?

Answer 45

Ag
Au

*jisme na wo cmpd bante hain

[Au(CN)2]^- phr [Zn(CN)4]^-2
[Ag(CN)2]^- phr [Zn(CN)4]^-2

Question 46

Which are oxidising & reducing agents respectively in hydro-metallurgy of Au/Ag?

Answer 46

O2 is oxidising agent.

Zn is reducing agent.

Question 47

Auto-reduction is for

Answer 47

Sulphide ores. As for Cu2S, PbS, HgS.

Here ore irself acts as reducing agent for its oxide.

Question 48

Smelting (reduction of ore using coke) is done for

Answer 48

ZnO
PbO
Fe2O3 by C at high temp. & by CO at low temp. (1079K)

Question 49

Reducing agent in thermite process is

Answer 49

Al

Mn3O4 / Cr2O3 —-> .. in presence of Al

Question 50

Mg is reducing agent in Kroll’s process.

Answer 50

True.

TiCl4 —> Ti + MgCl2 in presence of Mg.

Question 51

NiO & WO3 are reduced by

Answer 51

H2

Question 52

Flourspar is

Answer 52

CaF2

Question 53

Copper matte ?

Answer 53

Cu2S + FeS

Question 54

Van arkel process is for purification of

Answer 54

Ti, Zr, Hf

Question 55

Mond’s process id for the purification of

Answer 55

Ni.

Question 56

Zone refining is for

Answer 56

Si

Ga, Ge, As

Question 57

Distillation is done for

Answer 57

Zn
Cd
Hg

Question 58

Liquation is for purification of

Answer 58

Sn

Pb, Bi

Question 59

Thomas slag is

Answer 59

Ca3(PO4)2
Or
Ca3(PO4) + CaSiO3

Question 60

For purification of Cu, Ag, Au we use

Answer 60

Electro-refining

Question 61

Vapour phase refining?

Answer 61

Based on the principle that gaseous product formed in first step must be unstable.
2 methods:
Van arkel process (for Ti, Zr, Hf . Also for W,V.)
Mond’s process (for Ni.)

Question 62

Poling is a method of _______ and used for ____ ores.

Answer 62

Purification.

Used for Cu & Sn. Ore that has oxide impurity.