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Chemistry > Metallurgy > Flashcards

Metallurgy Flashcards

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1
Q

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

A

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

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2
Q

Iron ores?

A 
Haematite 
Magnetite
Siderite
Chromite
Iron pyrite
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3
Q

Copper ores?

A 
Cuprite
Malachite 
Azurite
Copper glance
Copper pyrite
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4
Q

Aluminium ores?

A

Bauxite
Cryolite
Kaolinite/china clay
Corrundum

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5
Q

Lead ores ?

A

Galena
Cerussite
Anglesite

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6
Q

Zinc ores ?

A

Sphaterite/ zinc blende
Calamine
Anglesite

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7
Q

Silver ores ?

A

Argentite/silver glance

Horn silver

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8
Q

Tin ore?

A

Casserite

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9
Q

Whats gangue & flux?

A

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

Flux= substances used to remove impurity(gangue).

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10
Q

Low fusible substance is c/d

A

Slag

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11
Q

Homogeneous mixture of 2 or more metals is c/d

A

Alloy

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12
Q

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

A

Electro metallurgy.

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13
Q

In pyrometallurgy, metals are extracted by

A

heating.

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14
Q

In hydro metallurgy, metal is extracted by

A

Dissolving in a suitable solvent.

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15
Q

Pulverisation means

A

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

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16
Q

Gravity separation is used for separation of

A

Oxide ores like Fe2O3, Fe3O4, Cu2O, SnO2

Carbonate ores like FeCO3, ZnCO3

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17
Q

Magnetic separation is used for separation of

A

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

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18
Q

Froth floatation is used for separation of

A

Sulphide ores except Argentite (Ag2S).

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19
Q

Which method is based on adsorption phenomenon?

A

Froth floatation.

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20
Q

In froth floatation, frother used is

A

Pine oil

Eucalyptus oil

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21
Q

In froth floatation, collector used is

A

Sodium ethyl xanthate.

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22
Q

In froth floatation, froth stabiliser used is

A

Cresol or anniline.

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23
Q

Beyer’s process is for

A

Red bauxite (Fe impurity)

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24
Q

Serpeck’s method is used in extraction of

A

Al from white bauxite (silicon impurity).

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25
Q

Calcination is

A

Heating ore in absence of O2 below its melting point.

26
Q

Roasting is

A

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

27
Q

Roasting: sulphide ores :: calcination:

A

Calcination: hydroxides/carbonates/hydrated ores

28
Q

SnO2, an oxide ore is ______ roasted/calcinated.

A

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

29
Q

Industries that extract metal from sulphide ores also produce

A

H2SO4.

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

30
Q

Give molecular formula of haematite

A

Fe2O3

31
Q

Give molecular formula of magnetite

A

Fe3O4

32
Q

Give molecular formula of siderite

A

FeCO3

33
Q

Give molecular formula of chromite

A

FeCr2O4

34
Q

Iron pyrite is a sulphide ore with formula

A

FeS2

35
Q

Formula of malachite & azurite

A 
Malachite = CuCO3.Cu(OH)2
Azurite = 2CuCO3.Cu(OH)2
36
Q

Copper pyrite is

A

CuFeS2

37
Q

Cuprite is

A

Cu2O

38
Q

Bauxite

A

Al2O3.H2O

39
Q

Formula of cryolite

A

Na3AlF6

40
Q

Kaolinite an ore of Aluminium has formula

A

Al2O3.SiO2.2H2O

41
Q

Galena, cerussite, anglesite have formula

A 
Galena = PbS
Cerussite = PbCO3
Anglesite = PbSO4
42
Q

Formula of zinc blende, calamine, zincite is

A

Zinc blende = ZnS
Calamine = ZnCO3
Zincite = ZnO

43
Q

Argentite/ silver glance =

A

Ag2S

Horn silver = AgCl

44
Q

Cassiterite is

A

Tin ore with formula SnO2

45
Q

Hydro metallurgy is adopted for reduction of ores of ____?

A

Ag
Au

*jisme na wo cmpd bante hain

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

46
Q

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

A

O2 is oxidising agent.

Zn is reducing agent.

47
Q

Auto-reduction is for

A

Sulphide ores. As for Cu2S, PbS, HgS.

Here ore irself acts as reducing agent for its oxide.

48
Q

Smelting (reduction of ore using coke) is done for

A

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

49
Q

Reducing agent in thermite process is

A

Al

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

50
Q

Mg is reducing agent in Kroll’s process.

A

True.

TiCl4 —> Ti + MgCl2 in presence of Mg.

51
Q

NiO & WO3 are reduced by

A

H2

52
Q

Flourspar is

A

CaF2

53
Q

Copper matte ?

A

Cu2S + FeS

54
Q

Van arkel process is for purification of

A

Ti, Zr, Hf

55
Q

Mond’s process id for the purification of

A

Ni.

56
Q

Zone refining is for

A

Si

Ga, Ge, As

57
Q

Distillation is done for

A

Zn
Cd
Hg

58
Q

Liquation is for purification of

A

Sn

Pb, Bi

59
Q

Thomas slag is

A

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

60
Q

For purification of Cu, Ag, Au we use

A

Electro-refining

61
Q

Vapour phase refining?

A

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.)

62
Q

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

A

Purification.

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

Chemistry (9 decks)

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