Thermosetting materials
Are cross-linked molecules
Soften on application of heat
Are solvent soluble
None of these
Correct Answer :
A. Are cross-linked molecules
Related Questions
Calcareous & argillaceous materials are used in the manufacture of
Lead
Cement
Carbon disulphide
None of these
Vegetable oils and fats basically differ in their
Density ranges
Physical state
Chemical composition
Chemical properties
Bisphenol A is produced by the condensation of acetone with
Formaldehyde
Ethyl alcohol
Diethyl ether
Phenol
Alcohol is produced by the
Oxidation of an aldehyde
Hydrolysis of an ether
Esterification of a fat
None of these
Reaction of calcium carbide with water produces a gas, which is used
As an illuminant
For metal cutting/welding
Both (A) & (B)
Neither (A) nor (B)
Glycerine is a by-product of the __________ industry.
Soap
Detergent
Oil hydrogenation
Paint
Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.
Chromium
Arsenic
Copper
Manganese
Bakelite is
Same as Polytetrafluoroethylene (PTFE)
An inorganic polymer
Same as thermosetting phenol-formaldehyde
Not a polymer
Flash point of most vegetable oils is about __________ °C.
50
100
200
300
Rotary kiln is not involved in the production of
Cement
Lime from limestone
Slaked lime from quick lime
None of these
Pick out the wrong statement. Iodine value of an oil or fat is
The number of grams of iodine taken up by 100 gm of oil or fat
A measure of its unsaturation
Helpful in findings its adulteration & its suitability for making soap
Independent of the type of oil, whether it is drying or non-drying
Claude process of gas liquefaction employs
Merely compression of gas beyond its critical pressure
Joule-Thomson expansion cooling
Heat exchange with colder stream
Adiabatic expansion against a piston or in a turbine
White phosphorous is stored under water, because
It does not react with water
It is poisonous
Its kindling temperature in dry air is very low
It is unstable
Which of the following is not present in bagasse fibre?
Cellulose
Lignin
Pentogens
None of these
The major constituents of glass are
Lime, clay and soda ash
Sand, lime and soda ash
Silica, alumina and clay
Silica, alumina and soda ash
Rancidity of the fatty oil can be reduced by its
Decoloration
Hydrogenation
Oxidation
Purification
Fourdrinier machine is used in the manufacture of
Sugar
Paper
Alcohol from molasses
Phenol formaldehyde
Dacron (or Terylene) fibres as compared to nylon fibres have
Better heat & acid resistant properties
Poorer resistance to alkalis
Poorer dyeability
All (A), (B) and (C)
Which of the following is not an abrasive material?
Bakelite
Pumice
Corundum
Carborundum
Boiling of water containing temporary hardness produces
CO2
CaSO4
CaHCO3
None of these
Which of the following is a detergent?
Fatty alcohol
Alkyl benzene sulphonate (ABS)
Fatty acids
Methylene chloride
Oleum produces fumes of
SO2
H2SO4
SO3
SO2 + H2SO4
Commercial production of calcium carbide requires limestone and __________ as raw materials.
Coke
Sand
Soda ash
Fuel oil
Gypsum is chemically
Calcium chloride
Potassium sulphate
Sodium sulphate
Calcium sulphate
A unit operation is exemplified by the process of
Reduction
Desorption
Nitration
Combustion
The drug used in contraceptives is
Sulfadiazine
Mestranol
Methyl salicylate
Penicillin
Phenol formaldehyde
Employs addition polymerisation
Employs condensation polymerisation
Is a monomer
Is an abrasive material
Esterification reaction
Produces soap
Is reversible
Is a reaction between an alcohol and an organic acid
All (A), (B) and (C)
Neoprene is a
Monomer
Synthetic rubber
Polyester
None of these
Fat dispersed in water is exemplified by
Colloids
Gel
Butter
Emulsion