The diameter of colloidal particle is of the order :

The diameter of colloidal particle is of the order :
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Answer :

The diameter of colloidal particle is of the order : A. `10^(-3)m` B. `10^(-6)m` C. `10^(-15)M` D. `10^(-7)m`
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Assertion :- Filtration of colloidal particles is not possible by filter paper. Reason :- Size of colloidal particle is less than filter paper pores.

Description : Assertion :- Filtration of colloidal particles is not possible by filter paper. Reason :- Size of colloidal particle is less than filter paper pores.

Last Answer : Assertion :- Filtration of colloidal particles is not possible by filter paper. Reason :- Size of ... D. If both Assertion & Reason are False.

The volume of a colloidal particle `V_C` as compared to the volume of a solute particle in a true solution `V_S` could be

Description : The volume of a colloidal particle `V_C` as compared to the volume of a solute particle in a true solution `V_S` could be

Last Answer : The volume of a colloidal particle `V_C` as compared to the volume of a solute particle in a true solution `V_S` could ... `~ 10^(-3)` D. `~ 10^(3)`

The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is A. Vs = 418 (Gs – Gw) d [(3T + 70)/100] B. Vs = 418 (Gs – Gw)d² [(3T + 70)/100] C. Vs = 218 (Gs – Gw)d² [(3T + 70)/100] D. Vs = 218 (Gs – Gw)d [(3T + 70)/100]

Description : The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is A. Vs = 418 (Gs – Gw) d [(3T + 70)/100] B. Vs = 418 (Gs – Gw)d² [(3T + 70)/100] C. Vs = 218 (Gs – Gw)d² [(3T + 70)/100] D. Vs = 218 (Gs – Gw)d [(3T + 70)/100]

Last Answer : ANS: B

If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is φs is defined by (A) φs = 6 Vp /dpsp (B) φs = Vp /dpsp (C) φs = 6 dpSp /Vp (D) φs = dpSp /Vp

Description : If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is φs is defined by (A) φs = 6 Vp /dpsp (B) φs = Vp /dpsp (C) φs = 6 dpSp /Vp (D) φs = dpSp /Vp

Last Answer : (A) φs = 6 Vp /dpsp

. Equivalent diameter of a particle is the diameter of the sphere having the same (A) Ratio of surface to volume as the actual volume (B) Ratio of volume to surface as the particle (C) Volume as the particle (D) None of these

Description : . Equivalent diameter of a particle is the diameter of the sphere having the same (A) Ratio of surface to volume as the actual volume (B) Ratio of volume to surface as the particle (C) Volume as the particle (D) None of these

Last Answer : (A) Ratio of surface to volume as the actual volume

The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle). (A) 6/D.ρ(B) 2/D.ρ (C) 4/D.ρ (D) 12/D.ρ

Description : The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle). (A) 6/D.ρ (B) 2/D.ρ (C) 4/D.ρ (D) 12/D.ρ

Last Answer : (A) 6/D.ρ

Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is (A) 0.5 (B) 1 (C) √2 (D) √3

Description : Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is (A) 0.5 (B) 1 (C) √2 (D) √3

Last Answer : (B) 1

Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle). (A) 6.V/D.S(B) V/6D.S (C) D.S/V (D) V/D.S

Description : Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle). (A) 6.V/D.S (B) V/6D.S (C) D.S/V (D) V/D.S

Last Answer : (B) V/6D.S (C) D.S/V (D) V/D.S

The specific surface of spherical particles is proportional to (where, Dp = diameter of particle). (A) D2 p (B) Dp (C) 1/Dp (D) 1/D2p

Description : The specific surface of spherical particles is proportional to (where, Dp = diameter of particle). (A) D2 p (B) Dp (C) 1/Dp (D) 1/D2p

Last Answer : (C) 1/Dp

In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter. (A) Inverse (B) Square root (C) Second power (D) First power

Description : In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter. (A) Inverse (B) Square root (C) Second power (D) First power

Last Answer : (B) Square root

A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20microns settling in the same oil will have a settling velocity (A) Same as that of A (B) One fourth as that of A (C) Twice as that of A (D) Four times as that of A

Description : A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20microns settling in the same oil will have a settling velocity (A) ... ) One fourth as that of A (C) Twice as that of A (D) Four times as that of A

Last Answer : (B) One fourth as that of A

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 × 10 3 VOM + 10.94 × 10 6 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is (A) 12 mm/s (B) 16 mm/s (C) 24 mm/s (D) 28 mm/s

Description : A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle ... fluidisation velocity, VOM is (A) 12 mm/s (B) 16 mm/s (C) 24 mm/s (D) 28 mm/s

Last Answer : (B) 16 mm/s

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below: Δ P/L = 375 × 10 3 VOM + 10.94 × 10 6 V2 OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed? (A) 0.2 (B) 0.5 (C) 0.7 (D) 0.8

Description : A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system ... What is the porosity of the fluidised bed? (A) 0.2 (B) 0.5 (C) 0.7 (D) 0.8

Last Answer : (C) 0.7

The importance of diffusion in a catalyst are increased by (A) Large catalyst particle size (B) An active surface of the catalyst (C) Small pore diameter (D) All (A), (B) and (C)

Description : The importance of diffusion in a catalyst are increased by (A) Large catalyst particle size (B) An active surface of the catalyst (C) Small pore diameter (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance. (A) Film diffusion (B) Diffusion through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)

Description : For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ... through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)

Last Answer : (C) Chemical reaction

For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance. (A) Film diffusion (B) Diffusion through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)

Description : For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, ... through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)

Last Answer : (B) Diffusion through ash layer

If the specific gravity of a soil particle of 0.05 cm diameter is 2.67, its terminal velocity while settling in distilled water of viscosity, 0.01 poise, is (A) 0.2200 cm/sec (B) 0.2225 cm/sec (C) 0.2250 cm/sec (D) 0.2275 cm/sec

Description : If the specific gravity of a soil particle of 0.05 cm diameter is 2.67, its terminal velocity while settling in distilled water of viscosity, 0.01 poise, is (A) 0.2200 cm/sec (B) 0.2225 cm/sec (C) 0.2250 cm/sec (D) 0.2275 cm/sec

Last Answer : (D) 0.2275 cm/sec

A suspended particle falls through a height minutes. If the viscosity of water is and specific gravity of the particle is , the diameter of the particle is (where M is a constant factor) (A) 103M (H/t) (B) 104M (H/t) (C) 105M (H/t) (D) 102M (H/t)

Description : A suspended particle falls through a height minutes. If the viscosity of water is and specific gravity of the particle is , the diameter of the particle is (where M is a constant factor) (A) 103M (H/t) (B) 104M (H/t) (C) 105M (H/t) (D) 102M (H/t)

Last Answer : Answer: Option C

A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to (A) √(Particle diameter) (B) Particle diameter (C) (Particle diameter)2 (D) (Particle diameter)3

Description : A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to (A) √(Particle diameter) (B) Particle diameter (C) (Particle diameter)2 (D) (Particle diameter)3

Last Answer : B) Particle diameter

Colloidal gold: do you use it , what do you use it for and does it work?

Description : Colloidal gold: do you use it , what do you use it for and does it work?

Last Answer : This took me four seconds.

Assertion Colloidal sols scatter light while true solutions do not. Reason The particles in the colloidal sol move slower than that of the true solutions. -Chemistry

Description : Assertion Colloidal sols scatter light while true solutions do not. Reason The particles in the colloidal sol move slower than that of the true solutions. -Chemistry

Last Answer : Both assertion and reason are true but the reason is not the correct explanation of assertion. The size of colloidal particles is large enough to scatter light while particles of a true solution are too small to scatter light.

Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do? -Maths 9th

Description : Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do? -Maths 9th

Last Answer : The colloidal particles are smaller and not heavy. They always remain in a state of zig-zag motion, called Brownian movement, which counters the force of gravity acting on colloidal particles and ... particles of suspension are larger, heavy and have less movement, thus settle down due to gravity.

Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do? -Maths 9th

Description : Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do? -Maths 9th

Last Answer : The colloidal particles are smaller and not heavy. They always remain in a state of zig-zag motion, called Brownian movement, which counters the force of gravity acting on colloidal particles and ... particles of suspension are larger, heavy and have less movement, thus settle down due to gravity.

Which colloidal solution is used in photography? -Do You Know?

Description : Which colloidal solution is used in photography? -Do You Know?

Last Answer : Photographic emulsion is a light-sensitive colloid used in film-based photography. Most commonly, in silver-gelatin photography, it consists of silver halide crystals dispersed in gelatin.

Which colloidal solution is commonly used as germ killer? -Do You Know?

Description : Which colloidal solution is commonly used as germ killer? -Do You Know?

Last Answer : colloidal solution is commonly used as germ killer soo therefore the option a is correct

Blood colloidal osmotic pressure mainly maintained by which plasma protein `:-`

Description : Blood colloidal osmotic pressure mainly maintained by which plasma protein `:-`

Last Answer : Blood colloidal osmotic pressure mainly maintained by which plasma protein `:-` A. Globulin B. Albumin C. Fibrinogen D. Prothombin

In domestic sewage, suspended solids, colloidal and dissolved materials constitute

Description : In domestic sewage, suspended solids, colloidal and dissolved materials constitute

Last Answer : In domestic sewage, suspended solids, colloidal and dissolved materials constitute A. 0.1 B. 0.056 C. 0.027 D. 0.001

Who called larger colloidal particles of primitives sea as coacervates :

Description : Who called larger colloidal particles of primitives sea as coacervates :

Last Answer : Who called larger colloidal particles of primitives sea as coacervates : A. Fox B. Oparin C. Empedcles D. Haldane

Aerosol is a system of colloidal particles having a size of

Description : Aerosol is a system of colloidal particles having a size of

Last Answer : Aerosol is a system of colloidal particles having a size of A. `5mum` B. `1-2 mum` C. less than `100 mum` D. more than `10 mum`

Assertion :- A gas mixed with another gas forms a colloidal solution. Reason :- Mixture of gases is homogenous system.

Description : Assertion :- A gas mixed with another gas forms a colloidal solution. Reason :- Mixture of gases is homogenous system.

Last Answer : Assertion :- A gas mixed with another gas forms a colloidal solution. Reason :- Mixture of gases is ... . D. If both Assertion & Reason are False.

Fog is a colloidal system of :-

Description : Fog is a colloidal system of :-

Last Answer : Fog is a colloidal system of :- A. gas in liquid B. liquid in gas C. gas in gas D. gas in solid

Colloidal solution show in `H_(2)O` :-

Description : Colloidal solution show in `H_(2)O` :-

Last Answer : Colloidal solution show in `H_(2)O` :- A. Paramagnetism B. Scttering of light (tyndall effect) C. Refraction D. All of these

The protcting power of lyophilic colloidal solution is expressed in terms of

Description : The protcting power of lyophilic colloidal solution is expressed in terms of

Last Answer : The protcting power of lyophilic colloidal solution is expressed in terms of A. Critical number B. ... number C. Coagulation value D. Gold number

Soaps essentially form a colloidal solution in water and remove the greasy matters by :

Description : Soaps essentially form a colloidal solution in water and remove the greasy matters by :

Last Answer : Soaps essentially form a colloidal solution in water and remove the greasy matters by : A. adsorption B. emulsification C. coagulation D. absorption

The colloidal system in which the disperse phase and dispersion medium are both liquids is known as :

Description : The colloidal system in which the disperse phase and dispersion medium are both liquids is known as :

Last Answer : The colloidal system in which the disperse phase and dispersion medium are both liquids is known as : A. an emulsion B. an areosol C. gel D. a foam

Smoke is a colloidal sol of

Description : Smoke is a colloidal sol of

Last Answer : Smoke is a colloidal sol of A. Gas dispersed in a solid B. solid dispersed in a gas C. solid dispersed in a liquid D. gas dispersed in a liquid

The dispersed phase in colloidal iron (III) hydroxide and collodial gold is positively and negtively charged respectively with of the following statem

Description : The dispersed phase in colloidal iron (III) hydroxide and collodial gold is positively and negtively charged respectively with of the following statem

Last Answer : The dispersed phase in colloidal iron (III) hydroxide and collodial gold is positively and negtively ... readily than the iron (III) hydroxide sol.

Choose the correct reason(s) for the stability of the lyophobic colloidal particles.

Description : Choose the correct reason(s) for the stability of the lyophobic colloidal particles.

Last Answer : Choose the correct reason(s) for the stability of the lyophobic colloidal particles. A. ... layer of opposite charges around the colloidal particles.

Which of the following represents macromolecular colloidal particles?

Description : Which of the following represents macromolecular colloidal particles?

Last Answer : Which of the following represents macromolecular colloidal particles? A. Solution of gold B. Cellulose C. Soaps D. Synthetic detergents

which of the following represents a multimolecular colloidal paricles?

Description : which of the following represents a multimolecular colloidal paricles?

Last Answer : which of the following represents a multimolecular colloidal paricles? A. Starch B. A sol of gold C. Proteins D. Soaps

size of colloidal particles may range from:

Description : size of colloidal particles may range from:

Last Answer : size of colloidal particles may range from: A. 1 to 1000 nm B. 10 to 100 pm C. 1 to 100 `mum` D. 1 to 10 mm

The colloidal system consisting of a liquid dispersed in a solid dispersion medium is termed as :

Description : The colloidal system consisting of a liquid dispersed in a solid dispersion medium is termed as :

Last Answer : The colloidal system consisting of a liquid dispersed in a solid dispersion medium is termed as : A. aerosol B. foam C. emulsion D. gel

Liquid-liquid colloidal system is known as

Description : Liquid-liquid colloidal system is known as

Last Answer : Liquid-liquid colloidal system is known as A. aerosol B. foam C. emulsion D. gel

A colloidal solution can be purified by the following method :

Description : A colloidal solution can be purified by the following method :

Last Answer : A colloidal solution can be purified by the following method : A. dialysis B. peptization C. filtration D. oxidation

Colloidal solution of gold prepared by different methods of different colours because of :

Description : Colloidal solution of gold prepared by different methods of different colours because of :

Last Answer : Colloidal solution of gold prepared by different methods of different colours because of : A ... particles D. impurities produced by different methods

What happens when a beam of light is passed through a colloidal sol?

Description : What happens when a beam of light is passed through a colloidal sol?

Last Answer : What happens when a beam of light is passed through a colloidal sol?

Identify dispersed phase and dispersion medium in the following colloidal dispersions : a. milk  b. blood  c. printing ink

Description : Identify dispersed phase and dispersion medium in the following colloidal dispersions : a. milk  b. blood  c. printing ink

Last Answer : Identify dispersed phase and dispersion medium in the following colloidal dispersions : a. milk b. blood c. printing ink d. fog

The size of colloidal particles lies between :

Description : The size of colloidal particles lies between :

Last Answer : The size of colloidal particles lies between : a. 10-10m and 10-9m b. 10-9m and 10-6m c. 10-6m and 10-4m d. 10-5m and 10-2m

Do you have colloidal Silver?

Description : Do you have colloidal Silver?

Last Answer : colloidal silver Do you have Colloidal Silver

What is one property of skim milk indicating that it is a colloidal dispersion?

Description : What is one property of skim milk indicating that it is a colloidal dispersion?

Last Answer : its dairy