Surface Chemistry

Question 1

2KClO3——– 2KCl + 3O2 catalyst used

Answer 1

MnO2

Question 2

2SO2 (g) ——–2 SO3 (g)

Answer 2

platinum

Question 3

catalyst used in ostwald’s process

Answer 3

platinum gauze

Question 4

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

Answer 4

methane CH4

Question 5

CO + 2 H2 ———- CH3OH catalyst used is

Answer 5

Cu/ZnO- Cr2O7

Question 6

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

Answer 6

copper

Question 7

Zeolites catalyst is made up

Answer 7

Aluminumsilicates

Question 8

zeolite used in peroleum industry

Answer 8

ZSM-5

Question 9

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

Answer 9

invertase

Question 10

C6H12O6 ———– C2H5OH enzyme involved is

Answer 10

Zymase

Question 11

Starch ——— Maltose enzyme used

Answer 11

Diastase

Question 12

contact process for manufacture of sulfuric acid the catalyst used is

Answer 12

platinum or V2O5

Question 13

paints and cell fluids are ———– colloid

Answer 13

solid liquid

Question 14

cheese butter is ———– colloid

Answer 14

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

Question 15

Milk and hair cream is —————-colloid

Answer 15

Emulsion (liquid liquid)

Question 16

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

Answer 16

Liquid in gas

Question 17

pumice stone and foam rubber is ———– colloid

Answer 17

gas in solid (solid sol)

Question 18

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

Answer 18

Gas in liquid (foam)

Question 19

colloids with alcohol as dispersion medium are called

Answer 19

Alcosol

Question 20

lyophilic sols do not undergo coagulation true or false

Answer 20

true

Question 21

size of multimolecular colloids is

Answer 21

less than 1nm

Question 22

Few stong electrolytes form colloids above a particular concentration called as

Answer 22

critical micelle concentration (CMC)

Question 23

micelle formation takes place above particular temperature called as

Answer 23

Kraft temperature

Question 24

CMC of soap is

Answer 24

10-4 to 10-5 mol L-1

Question 25

As2O3 on reaction with H2S gives a colloid whose formula is

Answer 25

As2S3

Question 26

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

Answer 26

sulfur

Question 27

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

Answer 27

AuCl3 +HCHO+H2O---------- Au+HCOOH+HCl

Question 28

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

Answer 28

Fe(OH)3

Question 29

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

Answer 29

Electrical disintegration or Bredig's Arc method

Question 30

precipitate is converted to colloidal sol by

Answer 30

peptisation (by using peptizing agent)

Question 31

Colloidal solutions are stabilized by small amounts of --------

Answer 31

electrolytes

Question 32

Pore size of filter paper can be reduced by use of-----------------

Answer 32

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

Question 33

ultramicroscope works on principle of ------------------

Answer 33

tyndall effect

Question 34

Mixture milk and water appears blue when viewed by----------- and red when viewed by ------------------

Answer 34

reflected light | transmitted light

Question 35

Haemoglobin sol carries ------------- electrical charge

Answer 35

positive

Question 36

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

Answer 36

positive | negetive

Question 37

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

Answer 37

negetive

Question 38

metals sols carry ----------- charge

Answer 38

negetive

Question 39

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

Answer 39

positive | negetive

Question 40

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

Answer 40

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

Question 41

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

Answer 41

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

Question 42

FeCl3 added to excess hot water SOl formed is

Answer 42

Fe2O3 xH2O/Fe3+ positively charged Sol

Question 43

FeCl3 added to NaOH sol formed is

Answer 43

Fe2O3.xH2O/OH- negatively charged sol

Question 44

colloids form two layers of opposites charges known as -----------

Answer 44

Helmholtz electrical double layer

Question 45

Potential difference due to Helmholtz electrical double layer is called

Answer 45

Zeta potential or electrokinetic potential

Question 46

movement of colloid particles under applied electric potential is called

Answer 46

electrophoresis

Question 47

prevention of movement of particles during electrophoresis leads to

Answer 47

electroosmosis movement of dispersion medium

Question 48

boiling of colloidal sol leads to

Answer 48

coagulation

Question 49

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

Answer 49

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

Question 50

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

Answer 50

Coagulating value

Question 51

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

Answer 51

PO43- as charge is highest

Question 52

factors responsible for stability of lyophillic sols

Answer 52

charge and solvation