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chemistry metallurgy > Surface Chemistry > Flashcards

Surface Chemistry Flashcards

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1
Q

2KClO3——– 2KCl + 3O2 catalyst used

A

MnO2

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2
Q

2SO2 (g) ——–2 SO3 (g)

A

platinum

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3
Q

catalyst used in ostwald’s process

A

platinum gauze

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4
Q

CO+3H2 ——– product formed when Ni is used as catalyst

A

methane CH4

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5
Q

CO + 2 H2 ———- CH3OH catalyst used is

A

Cu/ZnO- Cr2O7

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6
Q

CO+H2 ——– Formaldehyde (HCHO) catalyst used

A

copper

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7
Q

Zeolites catalyst is made up

A

Aluminumsilicates

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8
Q

zeolite used in peroleum industry

A

ZSM-5

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9
Q

C12H22O11 + H2O ———— Glucose +Fructose enzyme used

A

invertase

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10
Q

C6H12O6 ———– C2H5OH enzyme involved is

A

Zymase

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11
Q

Starch ——— Maltose enzyme used

A

Diastase

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12
Q

contact process for manufacture of sulfuric acid the catalyst used is

A

platinum or V2O5

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13
Q

paints and cell fluids are ———– colloid

A

solid liquid

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14
Q

cheese butter is ———– colloid

A

Liquid solid (dispersed phase and dispersion medium) called as gel

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15
Q

Milk and hair cream is —————-colloid

A

Emulsion (liquid liquid)

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16
Q

Smoke is Solid in gas colloid where as Fog mist and insecticide spray is

A

Liquid in gas

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17
Q

pumice stone and foam rubber is ———– colloid

A

gas in solid (solid sol)

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18
Q

froth, soap, whipped cream are —————— colloids

A

Gas in liquid (foam)

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19
Q

colloids with alcohol as dispersion medium are called

A

Alcosol

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20
Q

lyophilic sols do not undergo coagulation true or false

A

true

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21
Q

size of multimolecular colloids is

A

less than 1nm

22
Q

Few stong electrolytes form colloids above a particular concentration called as

A

critical micelle concentration (CMC)

23
Q

micelle formation takes place above particular temperature called as

A

Kraft temperature

24
Q

CMC of soap is

A

10-4 to 10-5 mol L-1

25
Q

As2O3 on reaction with H2S gives a colloid whose formula is

A

As2S3

26
Q

H2S gets oxidised by SO2 to form a substance which forms colloid in water. the substance is

A

sulfur

27
Q

AuCl3 is reduced by formaldehyde (HCHO) to form a colloid in water
the reaction is

A

AuCl3 +HCHO+H2O———- Au+HCOOH+HCl

28
Q

FeCl3 is hydrolysed to ———— which form a colloid

A

Fe(OH)3

29
Q

Colloidal sols of Au, Ag and Pt are generally prepared by

A

Electrical disintegration or Bredig’s Arc method

30
Q

precipitate is converted to colloidal sol by

A

peptisation (by using peptizing agent)

31
Q

Colloidal solutions are stabilized by small amounts of ——–

A

electrolytes

32
Q

Pore size of filter paper can be reduced by use of—————–

A

Colloidon solution eg 4% solution of nitro cellulose in mixture of alcohol and ether.

33
Q

ultramicroscope works on principle of ——————

A

tyndall effect

34
Q

Mixture milk and water appears blue when viewed by———– and red when viewed by ——————

A

reflected light

transmitted light

35
Q

Haemoglobin sol carries ————- electrical charge

A

positive

36
Q

Sols of metallic oxides carry ——-charge where as metallic sulfides carry ——– charge

A

positive

negetive

37
Q

Sols of starch, gum gelatin, clay and charcoal carry ——-charge

A

negetive

38
Q

metals sols carry ———– charge

A

negetive

39
Q

basic dye stuffs like methylene blue sols carry———— charge whereas acidic dye stuffs eg eosin, congo red sols carry ——–charge

A

positive

negetive

40
Q

Addition of AgNO3 solution to KI solution what is the resulting colloid

A

AgI/I- negetively charged colloid due to adsorption of I- from dispersion medium

41
Q

Colloidal Sol formed when KI solution is added to AgNO3 solution is

A

AgI/Ag+ positively charged due to adsorption of Ag+ from dispersion medium

42
Q

FeCl3 added to excess hot water SOl formed is

A

Fe2O3 xH2O/Fe3+ positively charged Sol

43
Q

FeCl3 added to NaOH sol formed is

A

Fe2O3.xH2O/OH- negatively charged sol

44
Q

colloids form two layers of opposites charges known as ———–

A

Helmholtz electrical double layer

45
Q

Potential difference due to Helmholtz electrical double layer is called

A

Zeta potential or electrokinetic potential

46
Q

movement of colloid particles under applied electric potential is called

A

electrophoresis

47
Q

prevention of movement of particles during electrophoresis leads to

A

electroosmosis movement of dispersion medium

48
Q

boiling of colloidal sol leads to

A

coagulation

49
Q

increasing order of power of coagulation of negative sol by Al3+, Ba2+and Na+

A

Al3+>Ba2+>Na+ flocculatiing power increases with charge

50
Q

minimum concntration of electrolyte in Millimoles per lit to cause precipitation of sol in two hours is called

A

Coagulating value

51
Q

coagulating value is lowest for PO4 3-, Cl-, SO4 2-

A

PO43- as charge is highest

52
Q

factors responsible for stability of lyophillic sols

A

charge and solvation

chemistry metallurgy (2 decks)

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