Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding (A) Glycerol (B) Nitro cellulose (C) Camphor (D) None of these

Crystallisation of polymers is an undesirable property. Crystallisation
of celluloid is prevented by adding
(A) Glycerol
(B) Nitro cellulose
(C) Camphor
(D) None of these
by

1 Answer

Answer :

(C) Camphor
by

Related questions

Pick up the correct statement from the following: (A) Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite (B) Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite (C) Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic (D) All the above

Description : Pick up the correct statement from the following: (A) Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite ... prepared a substance from urea and formaldehyde and called it Plastic (D) All the above

Last Answer : Answer: Option D

Celluloid is (A) Cellulose acetate (B) Regenerated cellulose (C) Cellulose nitrate (D) Cellulose acetate butyrat

Description : Celluloid is (A) Cellulose acetate (B) Regenerated cellulose (C) Cellulose nitrate (D) Cellulose acetate butyrat

Last Answer : (C) Cellulose nitrate

Celluloid is chemically (A) Cellulose acetate (B) Regenerated cellulose (C) Cellulose nitrate (D) Cellulose acetate butyrate

Description : Celluloid is chemically (A) Cellulose acetate (B) Regenerated cellulose (C) Cellulose nitrate (D) Cellulose acetate butyrate

Last Answer : (C) Cellulose nitrate

Camphor can easily be purified by the process of (a) Sublimation (b) Distillation (c) Crystallisation (d) Sedimentation

Description : Camphor can easily be purified by the process of (a) Sublimation (b) Distillation (c) Crystallisation (d) Sedimentation

Last Answer : Ans:(a)

Impure camphor is purified by (1) sublimation (2) fractional crystallisation (3) fractional distillation (4) steam distillation

Description : Impure camphor is purified by (1) sublimation (2) fractional crystallisation (3) fractional distillation (4) steam distillation

Last Answer : sublimation

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to (A) Avoid mechanical weakening of fibre (B) Remove lignin by way of crystallisation (C) Increase the cellulose content (D) None of these

Description : The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to (A) Avoid mechanical weakening of fibre (B) Remove lignin by way of crystallisation (C) Increase the cellulose content (D) None of these

Last Answer : (A) Avoid mechanical weakening of fibre

Which of the following is an explosive? (A) Nitro-glycerine (B) Trinitrotoluene (TNT) (C) Cellulose nitrate (D) All (A), (B), and (C)

Description : Which of the following is an explosive? (A) Nitro-glycerine (B) Trinitrotoluene (TNT) (C) Cellulose nitrate (D) All (A), (B), and (C)

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

The first plastic was a mixture of cellulose nitrate and camphor invented in the 1860's by John Hyatt. What was the trademark given to this material?

Description : The first plastic was a mixture of cellulose nitrate and camphor invented in the 1860's by John Hyatt. What was the trademark given to this material?

Last Answer : ANSWER: CELLULOID

Lacquer paints (A) Are generally applied on structural steel (B) Are less durable as compared to enamel paints (C) Consist of resin and nitro-cellulose (D) All the above

Description : Lacquer paints (A) Are generally applied on structural steel (B) Are less durable as compared to enamel paints (C) Consist of resin and nitro-cellulose (D) All the above

Last Answer : Answer: Option D

Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2 . Which of the following polymers has the maximum film elongation (of the order of 100%)? (A) Water impermeable cellophane(B) Polythene(C) Cellulose acetate(D) Teflon

Description : Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2 . Which of the following polymers has the maximum film elongation (of the order of 100%)? (A) Water impermeable cellophane (B) Polythene (C) Cellulose acetate (D) Teflon

Last Answer : (B) Polythene

Identify the group in which all the polymers mentioned can be used to make fibres. (A) Butadiene copolymers, Polyamides, Urea-formaldehyde (B) Cellulose derivatives, Polyisoprene, Polyethylene (C) Cellulose derivatives, Polyamides, Polyurethane (D) Polypropylene, Poly vinyl chloride, Silicon

Description : Identify the group in which all the polymers mentioned can be used to make fibres. (A) Butadiene copolymers, Polyamides, Urea-formaldehyde (B) Cellulose derivatives, Polyisoprene, Polyethylene (C) Cellulose derivatives, Polyamides, Polyurethane (D) Polypropylene, Poly vinyl chloride, Silicon

Last Answer : (B) Cellulose derivatives, Polyisoprene, Polyethylene

Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids? (A) Starch (B) Cellulose (C) Proteins (D) Nucleic acids

Description : Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids? (A) Starch (B) Cellulose (C) Proteins (D) Nucleic acids

Last Answer : (C) Proteins

38. Which of the following statements is false? (1) Both starch and cellulose are polymers of glucose (2) Artificial silk is derived from cellulose (3) Nylon-66 is an example of elastomer (4) The repeat unit in natural rubber is isoprene

Description : 38. Which of the following statements is false? (1) Both starch and cellulose are polymers of glucose (2) Artificial silk is derived from cellulose (3) Nylon-66 is an example of elastomer (4) The repeat unit in natural rubber is isoprene

Last Answer : Nylon-66 is an example of elastomer

The complex of sugar polymers and proteins which are patchily distributed on the plasma membranes of animal cells is called a) cellulose b) chitin c) glyocalyx d) cytoskeleton

Description : The complex of sugar polymers and proteins which are patchily distributed on the plasma membranes of animal cells is called a) cellulose b) chitin c) glyocalyx d) cytoskeleton

Last Answer : ANSWER: C -- GLYOCALYX

Identify the substances having glycosidic bond and peptide bond, respectively in their structure. (a) Chitin, cholesterol (b) Glycerol, trypsin (c) Cellulose, lecithin (d) Inulin, insulin

Description : Identify the substances having glycosidic bond and peptide bond, respectively in their structure. (a) Chitin, cholesterol (b) Glycerol, trypsin (c) Cellulose, lecithin (d) Inulin, insulin

Last Answer : (d) Inulin, insulin

Corrosion in boilers can be prevented by (A) Deaeration of feed water (B) Enhancing pH of feed water by adding alkali (C) Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion (D) All (A), (B) and (C)

Description : Corrosion in boilers can be prevented by (A) Deaeration of feed water (B) Enhancing pH of feed water by adding alkali (C) Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion (D) All (A), (B) and (C)

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

(2) stabilise the colloid and prevent crystallisation Explanation: Gelatine, being a colloid, has the property of preventing crystallization. In ice lollies and icecream this is demonstrated by the formation of a very fine crystal structure on freezing. This goes much further in that gelatine stabilized icecream does not become grainy or sandy due to the slow crystallisation of lactose with time.

Description : (2) stabilise the colloid and prevent crystallisation Explanation: Gelatine, being a colloid, has the property of preventing crystallization. In ice lollies and icecream this is demonstrated by the formation ... does not become grainy or sandy due to the slow crystallisation of lactose with time.

Last Answer : Glycol is added to aviation gasoline because it - (1) reduces evaporation of petrol (2) increases efficiency of petrol (3) prevents freezing of petrol (4) reduces consumption of petrol

Blood clotting can be prevented in a test tube by adding a little

Description : Blood clotting can be prevented in a test tube by adding a little

Last Answer : Blood clotting can be prevented in a test tube by adding a little A. Sodium oxalate B. Sodium chloride C. Sodium hydroxide D. Ammonium chloride

Radical shifts can be prevented by adding a. Acids b. Alkali c. Buffer d. None of these

Description : Radical shifts can be prevented by adding a. Acids b. Alkali c. Buffer d. None of these

Last Answer : Ans: C

Poly Tetrafluoroethylene (P.T.F.E.) is known as (A) Bakelite (B) Teflon (C) Celluloid (D) Dacron

Description : Poly Tetrafluoroethylene (P.T.F.E.) is known as (A) Bakelite (B) Teflon (C) Celluloid (D) Dacron

Last Answer : (B) Teflon

Pick out the undesirable property for a solvent meant for dewaxing of lube oil. (A) Complete miscibility with oil (B) High solubility of wax in the solvent (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Pick out the undesirable property for a solvent meant for dewaxing of lube oil. (A) Complete miscibility with oil (B) High solubility of wax in the solvent (C) Both (A) and (B) (D) Neither (A) nor (B)

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Which of the following is an undesirable property for an absorbingsolvent? (A) Low vapour pressure (B) Low velocity (C) Low freezing point (D) None of these

Description : Which of the following is an undesirable property for an absorbingsolvent? (A) Low vapour pressure (B) Low velocity (C) Low freezing point (D) None of these

Last Answer : (D) None of these

Which of the following is an undesirable property in a tower packing? (A) Large surface per unit volume (B) Large free cross-section (C) Low weight per unit volume (D) Large weight of liquid retained

Description : Which of the following is an undesirable property in a tower packing? (A) Large surface per unit volume (B) Large free cross-section (C) Low weight per unit volume (D) Large weight of liquid retained

Last Answer : (D) Large weight of liquid retained

Which of the following is an undesirable property of a manometricliquid? (A) Non-sticky & non-corrosive nature (B) High vapour pressure (C) Low viscosity & surface tension (D) Low co-efficient of thermal expansion

Description : Which of the following is an undesirable property of a manometricliquid? (A) Non-sticky & non-corrosive nature (B) High vapour pressure (C) Low viscosity & surface tension (D) Low co-efficient of thermal expansion

Last Answer : (B) High vapour pressure

High __________ is an undesirable property for a good refrigerant. (A) Specific heat (B) Latent heat of vaporisation (C) Viscosity (D) Specific vapor volume

Description : High __________ is an undesirable property for a good refrigerant. (A) Specific heat (B) Latent heat of vaporisation (C) Viscosity (D) Specific vapor volume

Last Answer : (C) Viscosity

ick out the undesirable property for a good refrigerant. (A) High thermal conductivity (B) Low freezing point (C) Large latent heat of vaporisation (D) High viscosity

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Last Answer : (D) High viscosity

Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore? (A) High fusibility & fluidity (B) High thermal conductivity (C) Low density (D) High chemical activity

Description : Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore? (A) High fusibility & fluidity (B) High thermal conductivity (C) Low density (D) High chemical activity

Last Answer : B) High thermal conductivity

Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays

Description : Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays

Last Answer : (A) Polymeric fibres are never produced by addition polymerisation

Pick out the correct combination about the role of various additives used in polymers. (A) Plasticiser: increases the polymer strength (B) Heat stabiliser: increases the maximum service temperature (C) Fillers: Does not affect the property of polymer but increases its weight (D) Lubricants: increases the flexibility of polymers

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Last Answer : Option C

Which of the following is a good conductor of heat but bad conductor of electricity? (1) mica (2) asbestos (3) celluloid (4) paraffin wax

Description : Which of the following is a good conductor of heat but bad conductor of electricity? (1) mica (2) asbestos (3) celluloid (4) paraffin wax

Last Answer : (1) mica Explanation: Mica is a good conductor of heat but bad conductor of electricity.

Which of the following is a good conductor of heat but a bad conductor of electricity? (1) Celluloid (2) Rubber (3) Asbestos (4) Mica

Description : Which of the following is a good conductor of heat but a bad conductor of electricity? (1) Celluloid (2) Rubber (3) Asbestos (4) Mica

Last Answer : (4) Mica Explanation: Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly ... to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.

Which of the following is a good conductor of heat but bad conductor of electricity ? (1) mica (2) asbestos (3) celluloid (4) paraffin wax

Description : Which of the following is a good conductor of heat but bad conductor of electricity ? (1) mica (2) asbestos (3) celluloid (4) paraffin wax

Last Answer : mica

Which of the following is a good conductor of heat but a bad conductor of electricity ? (1) Celluloid (2) Rubber (3) Asbestos (4) Mica

Description : Which of the following is a good conductor of heat but a bad conductor of electricity ? (1) Celluloid (2) Rubber (3) Asbestos (4) Mica

Last Answer : Mica

Which colligative property is used to determine the molecular masses of the polymers ?

Description : Which colligative property is used to determine the molecular masses of the polymers ?

Last Answer : Ans. Osmotic pressure is the colligative property used to determine the molecular masses of polymer.

Separation of two or more components of a liquid solution cannot beachieved by (A) Fractional crystallisation (B) Liquid extraction (C) Absorption (D) Evaporation

Description : Separation of two or more components of a liquid solution cannot beachieved by (A) Fractional crystallisation (B) Liquid extraction (C) Absorption (D) Evaporation

Last Answer : (C) Absorption

Unit operation involved in the prilling of urea is (A) Evaporation (B) Drying (C) Crystallisation (D) Both (B) and (C)

Description : Unit operation involved in the prilling of urea is (A) Evaporation (B) Drying (C) Crystallisation (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

ADDUCTS' and 'CLATHRATES' are used in case of (A) Extractive distillation (B) Crystallisation (C) Absorption (D) None of these

Description : ADDUCTS' and 'CLATHRATES' are used in case of (A) Extractive distillation (B) Crystallisation (C) Absorption (D) None of these

Last Answer : (B) Crystallisation

During crystallisation, formation of crystal can occur in __________ solution only. (A) Saturated (B) Supersaturated (C) Under-saturated (D) All (A), (B) and (C)

Description : During crystallisation, formation of crystal can occur in __________ solution only. (A) Saturated (B) Supersaturated (C) Under-saturated (D) All (A), (B) and (C)

Last Answer : (B) Supersaturated

Crystallisation of solids from a homogeneous solution is a/an __________ process. (A) Exothermic (B) Mildly endothermic (C) Highly endothermic (D) None of these

Description : Crystallisation of solids from a homogeneous solution is a/an __________ process. (A) Exothermic (B) Mildly endothermic (C) Highly endothermic (D) None of these

Last Answer : (A) Exothermic

Duhring’s rule is important in solving problems on (A) Distillation (B) Crystallisation (C) Evaporation (D) Humidification

Description : Duhring’s rule is important in solving problems on (A) Distillation (B) Crystallisation (C) Evaporation (D) Humidification

Last Answer : (C) Evaporation

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is (A) More (B) Less (C) Same (D) More or less; depends on the nature of solution

Description : In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is (A) More (B) Less (C) Same (D) More or less; depends on the nature of solution

Last Answer : (A) More

The driving potential for the crystal growth during crystallisation is the __________ of the solution. (A) Concentration (B) Viscosity (C) Super-saturation (D) Density

Description : The driving potential for the crystal growth during crystallisation is the __________ of the solution. (A) Concentration (B) Viscosity (C) Super-saturation (D) Density

Last Answer : (C) Super-saturation

Concentration of hydrogen peroxide is done by(A) Crystallisation(B) Vacuum crystallisation(C) Atmospheric distillation(D) Dehydration

Description : Concentration of hydrogen peroxide is done by (A) Crystallisation (B) Vacuum crystallisation (C) Atmospheric distillation (D) Dehydration

Last Answer : (B) Vacuum crystallisation

Solvay process as compared to dual process (i.e. modified Solvay process). (A) Can use low grade brine (B) Has less corrosion problems (C) Involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl(D) Both (B) and (C)

Description : Solvay process as compared to dual process (i.e. modified Solvay process). (A) Can use low grade brine (B) Has less corrosion problems (C) Involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

One of the steps during refining of cane sugar consists of addition ofhydrated lime to the sugar syrup followed by carbonation of the resultingsolution. The purpose of this step is to(A) Adjust the pH of the syrup(B) Remove the coloring matter from the syrup(C) Reduce the viscosity of the syrup(D) Improve the rate of crystallisation of sugar

Description : One of the steps during refining of cane sugar consists of addition ofhydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to (A) Adjust ... (C) Reduce the viscosity of the syrup (D) Improve the rate of crystallisation of sugar

Last Answer : (A) Adjust the pH of the syrup

Which of the following solutions will follow Raoult's law most closely? (A) A solution of benzene, toluene and o-xylene (B) 35% solution of camphor in water (C) 35% solution of NH3 in water (D) A solution of polar organic compounds (not of homologue of a series)

Description : Which of the following solutions will follow Raoult's law most closely? (A) A solution of benzene, toluene and o-xylene (B) 35% solution of camphor in water (C) 35% solution of NH3 in water (D) A solution of polar organic compounds (not of homologue of a series)

Last Answer : (A) A solution of benzene, toluene and o-xylene

Which is the best fertiliser for paddy? (A) Ammonium sulphate (B) Nitro-phosphate (C) Superphosphate (D) Potassium nitrate

Description : Which is the best fertiliser for paddy? (A) Ammonium sulphate (B) Nitro-phosphate (C) Superphosphate (D) Potassium nitrate

Last Answer : (A) Ammonium sulphate

Nitro-phosphate (manufactured at Trombay-India) is a __________ fertiliser. (A) Mixed (B) Complex (C) Highly hygroscopic (D) Highly explosive

Description : Nitro-phosphate (manufactured at Trombay-India) is a __________ fertiliser. (A) Mixed (B) Complex (C) Highly hygroscopic (D) Highly explosive

Last Answer : (B) Complex

Nitro-glycerine absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as controlled explosive called dynamite. The raw material used for its manufacture are glycerine, nitric acid and (A) Sulphuric acid (B) Phosphoric acid (C) Hydrochloric acid (D) Hydrofluoric acid

Description : Nitro-glycerine absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as controlled explosive called dynamite. The raw material used for its manufacture are glycerine, nitric acid and (A) Sulphuric acid (B) Phosphoric acid (C) Hydrochloric acid (D) Hydrofluoric acid

Last Answer : (A) Sulphuric acid

Gun powder, which is an explosive comprises of charcoal, sulphur and (A) Glycerine (B) Salt petre (C) Nitro glycerine (D) Dynamite

Description : Gun powder, which is an explosive comprises of charcoal, sulphur and (A) Glycerine (B) Salt petre (C) Nitro glycerine (D) Dynamite

Last Answer : (B) Salt petre