COLLOIDAL STATE MCQs

COLLOIDAL STATE MCQs

What is happened in the process of electrosmosis?

  1. Only dispersion medium moves to carry the current
  2. Both, colloidal particles and dispersion medium move
  3. Colloidal particles move towards the electrodes
  4. Positively charged colloidal particles move, but negatively charged particles remain stationary

Only dispersion medium moves to carry the current


Which one of the following can act as disperse phase of the colloidal system?

  1. Solid
  2. Liquid
  3. Gas
  4. All of A, B, and C

All of A, B, and C


A system is considered to be in ne suspension state if the particle size of the dispersed phase ranges is ____.

  1. < 100 nm
  2. > 100 nm
  3. > 100 micrometer
  4. > 100 Å

> 100 nm


Which colligative properties can be helpful and used to characterize colloidal particles?

  1. Lowering in vapor pressure
  2. Osmotic pressure
  3. Depression in freezing point
  4. Elevation in boiling point

Osmotic pressure


Colloids can be purified by which one of the following?

  1. Dialysis
  2. Coagulation
  3. The Breeding arc method
  4. Peptization

Dialysis


The process of removing dissolved impurities from a colloidal system, by means of diffusion through a suitable membrane under the influence of an electric field, is called

  1. Electrosmosis
  2. Peptization
  3. Electrophoresis
  4. Electrodialysis

Electrodialysis


The migration of positively charged colloidal particles, under an electrical field, towards the cathode is called __?

  1. Electrodialysis
  2. Electrosmosis
  3. Sedimentation
  4. Cataphoresis

Cataphoresis


Smoke is a dispersion of

  1. Liquid in gas
  2. Gas in solid
  3. Solid in gas
  4. Gas in gas

Solid in gas


Which electrolytes will be most effective in the coagulation of arsenious sulphide sol?

  1. AIPO4
  2. MgSO4
  3. NaNO3
  4. K4[Fe(CN)6]

AIPO4


In emulsions, What are the dispersed phase and the dispersion medium?

  1. Both solids
  2. Both gases
  3. Both liquids
  4. Phase is liquid and medium is solid

Both liquids


In a lyophobic sol, the stability of the scattered phase results from which of the following?

  1. The formation of an electrical layer between the two phases
  2. The surface tension of the medium
  3. Liking for the dispersion medium
  4. The viscosity of the medium

The formation of an electrical layer between the two phases


A silver iodide sol was prepared by mixing KI and AgNO2 solutions with the AgNO, in slight excess. Which descriptions is true regarding is sol particles?

  1. Negatively charged because of the excess of NO3 ions
  2. Neutral
  3. Negatively charged because I ions are adsorbed from the KI solution
  4. Positively charged because of the excess of Ag+ ions in the AgI lattice

Positively charged because of the excess of Ag+ ions in the AgI lattice


An emulsifier is an agent which can ______

  1. Helps in the formation of an emulsion
  2. Homogenizes an emulsion
  3. Causes coagulation of an emulsion
  4. Stabilizes an emulsion

Stabilizes an emulsion


When a strong beam of light is passed through a colloidal solution, the light will ____.

  1. reflected
  2. dispersed
  3. scattered
  4. Pass unchanged

Scattered


____ is a colloidal system in which a liquid is dispersed in a solid.

  1. Gel
  2. Sol
  3. Emulsion
  4. Precipitate

Gel


The gold numbers of some hydrophilic substances are Gelatin 0.005-0.01, Egg albumen 0.08 -0.10, Gum Arabic 0.10-0.15, Soluble starch 10-15 which of the these will act ideal as a protective colloid?

  1. Gum Arabic
  2. Egg albumen
  3. Soluble starch
  4. Gelatin

Gelatin


Which can act as a protective colloid?

  1. Oil-in-water emulsion
  2. Silica gel
  3. Gelatin
  4. All three

Gelatin


Which will be most effective in the coagulation of Fe(OH)3 sol?

  1. AlCl3
  2. MgSO4
  3. Mg3(PO4)2
  4. NaCl

AlCl3


The process of passing of a precipitate into colloidal solution, on adding an electrolyte, is called

  1. Dialysis
  2. Electrosmosis
  3. Electrophoresis.
  4. Peptization

Peptization


The Tyndall effect was helpful and used by Zsigmondy to devise

  1. The ultracentrifuge
  2. The ultramicroscope
  3. The osmometer
  4. Electrodialysis

The ultramicroscope


The arsenic’s colloidal solution prefers to absorb

  1. S2-
  2. K+
  3. NO3
  4. H+

S2-


A system is considered to be in the colloidal state if the particle size of the dispersed phase ranges from

  1. 1 to 10 Å
  2. 10 to 1000 Å
  3. 10 to 100 Å
  4. 0.5 to 1 Å

10 to 1000 Å


The Tyndall effect is not observed in

  1. Suspensions
  2. True solutions
  3. Colloidal solutions
  4. Emulsions

True solutions


When a freshly formed precipitate of stannic oxide is peptised by a small amount of sodium hydroxide, the colloidal particles may be described as

  1. [SnO2] Sn4+ : OH
  2. [SnO2] Na+ : OH
  3. [SnO2] Sn4+ : O2-
  4. [SnO2] SnO22- : 2Na+

[SnO2] SnO22- : 2Na+


Which statement is not true regarding the Stern theory of charge on colloidal particles?

  1. The greater the concentration and charge of ions in the diffused electrical double layer, the larger is the thickness of the layer
  2. In the immediate vicinity of the colloidal particles there is an excess of counter ions
  3. The colloidal particle has a charge distribution at its surface
  4. At large distance from the colloidal particles, the concentrations of co-ions and counter-ions are almost equal

The greater the concentration and charge of ions in the diffused electrical double layer, the larger is the thickness of the layer


Which substances is an example of colloidal state?

  1. Fog
  2. Milk
  3. Blood
  4. All of A, B, and C

All of A, B, and C


In ice cream/solid foam, which is/are the dispersed phase and the dispersion medium?

  1. Phase is gas and medium is solid
  2. Both liquids
  3. Both gases
  4. Both solids

Phase is gas and medium is solid


In curd/jelly, Which is/are the dispersed phase and the dispersion medium?

  1. Phase is liquid and medium is solid
  2. Both liquids
  3. Both gases
  4. Both solids

Phase is liquid and medium is solid


In clouds/fog/mist, the dispersed phase and the dispersion medium are

  1. Both solids
  2. Both liquids
  3. Phase a liquid and medium in gas
  4. Both gases

Phase a liquid and medium in gas


In milk/oil in water, Which is/are the dispersed phase and the dispersion medium?

  1. Both solids
  2. Phase is liquid and medium in solid
  3. Both gases
  4. Both liquids

Both liquids


Which methods is/are helpful and used in the preparation of colloids?

  1. Reduction.
  2. Oxidation
  3. Hydrolysis
  4. All of A, B, and C

All of A, B, and C


In ruby/gem, Which is/are the dispersed phase and the dispersion medium?

  1. Phase is liquid and medium is solid
  2. Both liquids
  3. Both gases
  4. Both solids

Both solids


Which factors is/are responsible for the development of charge on colloids?

  1. Presence of acidic or basic group
  2. Dissociation of surface molecules
  3. Preferential adsorption of ions
  4. All of A, B, and C

All of A, B, and C


_______is a colloidal system in which both the dispersion phase and dispersed phase are liquid.

  1. Smoke
  2. Whipped cream
  3. Emulsion
  4. Mist

Emulsion


Which statement is not true with regard to lyophobic sols?

  1. These are normally inorganic materials
  2. They are normally stable
  3. Surface tension is similar to dispersion medium
  4. Particles carry some charge

They are normally stable


According to Hardy-Schulze law, What is the precipitation power of the electrolytes for negative sol?

  1. Na+ > Mg++ > Al+++
  2. Na+ > Al++++ > Mg++
  3. Al+++ > Mg++ > Na+
  4. Mg++ = Mg++ > Al+++

Al+++ > Mg++ > Na+


Which parameters are/is helpful and used to express the protective action of sols?

  1. Gold number
  2. Iron number
  3. Rubin number
  4. All of A, B, and C

All of A, B, and C


The minimum concentration of the electrolyte needed to bring coagulation of the sols is called_________ .

  1. Precipitation value
  2. Iron number
  3. Rubin number
  4. Gold number

Precipitation value


Which statement is not true with regard to lyophilic sols?

  1. These are normally organic materials
  2. They are normally unstable
  3. Surface tension is lower to dispersion medium
  4. Particles may have little/no charge

They are normally unstable


At critical micelle concentration (CMC), the surface molecules

  1. Associate
  2. Dissociate
  3. Decompose
  4. Become soluble

Associate

Which statement is not true?

  1. Particles of lyophilic sols are highly hydrated
  2. More electrolyte is needed to precipitate lyophilic sols in comparison
  3. Lyophilic sols have higher viscosity than that the medium
  4. Lyophobic sols are reversible

Lyophobic sols are reversible


What is the precipitation value of NaCl for negative sol?

  1. 51
  2. 0.65
  3. 0.325
  4. 0.093

51


Which protective colloids has large value of gold number?

  1. Starch
  2. Albumin
  3. Hemoglobin
  4. Gelatin

Starch


Which protective colloid has small value of gold number?

  1. Gelatin
  2. Albumin
  3. Hemoglobin
  4. Starch

Gelatin


Emulsifying agent in milk is

  1. Protein casein
  2. Fat
  3. Enzymes
  4. Lactic acid

Protein casein


blood and blood clot are the colloidal state parlance, respectively

  1. Emulsion, gel; sol
  2. Gel, sol, emulsion
  3. Emulsion, sol, gel
  4. Aerosols, sol, gel

Emulsion, sol, gel


Which act as associated colloids?

  1. Substances like colloids only at lower temperature
  2. Substances like colloids only at higher concentration
  3. Aggregates of colloids with diameter less than 1 cm
  4. None of A, B, and C

Substances like colloids only at higher concentration


Which technique is helpful and used to separate proteins from salts?

  1. Dialysis
  2. Diffusion.
  3. Osmosis
  4. Transportation

Dialysis


Milk may be kept fresh by incorporating a few drops of

  1. Formic acid
  2. Formaldehyde
  3. Acetic acid
  4. Acetaldehyde

Formaldehyde


As2O3 sol is

  1. Negatively charged
  2. Neutral
  3. Positively charged
  4. None of A, B, and C

Negatively charged


According to Hardy-Schulze law,  What is the precipitation power of the electrolytes for positive sol?

  1. Phosphate > Sulfate > Chloride
  2. Chloride > Sulfate > Phosphate
  3. Chloride = Sulfate = Phosphate
  4. Chloride > Phosphate > sulfate

Phosphate > Sulfate > Chloride


Colloidal sulfur is prepared by the reaction of following

  1. H₂SO4 and H2S2O8
  2. I2 and Na2S2O3
  3. FeCl3 and H2S
  4. FeCl2 and Na2S

FeCl3 and H2S


Tyndall effect is more pronounced in which of the following?

  1. Lyophobic sol
  2. Lyophilic sol
  3. Starch solution
  4. Foam

Lyophobic sol


A sol has a very low osmotic pressure because of

  1. Large size of the particles
  2. Its association
  3. Its dissociation
  4. Its charge

Large size of the particles


Which is an example of associated colloids?

  1. Rubber and benzene
  2. Protein and water
  3. Soap and water
  4. As2O3sol

Soap and water


Which is a hydrophilio colloidal solution?

  1. Starch sol
  2. Arsenic sulfide
  3. Barium sulfate solution
  4. Silver iodide sol

Starch sol



At the isoelectric point

  1. The pH of the sol becomes 7
  2. Sol coagulates
  3. Sol becomes electrically neutral
  4. None of A, B, and C

Sol coagulates


Which is true for lyophilic sols?

  1. They are self-stabilized
  2. Formed by inorganic substances
  3. Readily coagulated by the addition of electrolytes
  4. Irreversible in nature

They are self-stabilized


Which is a hetero polar sols?

  1. Rubber in toluene
  2. Sulfur in water
  3. Starch in water
  4. Protein in water

Protein in water


To Which pumice stone belongs?

  1. Gel
  2. Foam
  3. Aerosol
  4. Emulsion

Foam

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