Molecular weight of plastics ranges from
5000 to 10000
20000 to 250000
500 to 5000
106 to 109
Correct Answer :
B. 20000 to 250000
Related Questions
Fire clay is __________ refractory material.
A basic
An acidic
A neutral
Not a
The major use of butadiene is
As a plasticiser for unsaturated polyester
In the manufacture of synthetic rubber
As an anti-skinning agent in paint
None of these
Gypsum is chemically
Calcium chloride
Potassium sulphate
Sodium sulphate
Calcium sulphate
__________ is not a constituent of gun powder.
Carbon
Charcoal
Sulphur
Potassium nitrate
Chrome tanning and vegetable tanning are done for
Light & heavy leather respectively
Heavy & light leather respectively
Both light & heavy leather
Neither light nor heavy leather
Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of
Nitric acid
Sulphuric acid
Ammonium sulphate
Hydrochloric acid
Fourdrinier machine is used in the manufacture of
Sugar
Paper
Alcohol from molasses
Phenol formaldehyde
Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo?
Depithing
Digestion
Bleaching
None of these
Pick out the wrong statement.
Pasteurisation of milk involves moderate heating followed by cooling
Bakeries and breweries make use of yeasts
Enzyme is a complex nitrogenous compound
Oils and fats are alkaloids
During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to
Increase the rate of absorption
Avoid corrosion
Reduce the cooling water circulation rate
None of these
Margarine is a/an
Fat
Explosive
Plasticiser
Rocket propellant
Esterification reaction produces
Detergent
Vanaspati
Soap
Mercaptans
Pure rectified spirit contains about __________ percent alcohol.
45
70
95
99.5
Main constituents of cotton fiber is
Lignin
Cellulose
Starch
Gelatine
Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.
Emulsification
Dispersion
Precipitation
Wetting
Fish contains about __________ percent oil.
5
10
20
35
Pick out the wrong statement pertaining to the soap manufacture.
Transparent soaps are made by cold process
Organic pigments are used as colouring materials in the soap manufacture
Both laundry as well as toilet soaps are manufactured by hot process
Colourless rosin is used in the manufacture of laundry soaps
Which of the following impurities in feed water for high pressure boiler is the most detrimental?
Silica
Dissolved oxygen
Suspended salt
Dissolved salt
10% oleum comprises of 10% free
SO2
H2SO3
SO3
H2SO4
Sucrose content in the raw juice extracted from sugar cane is about __________ percent.
1 - 2
15 - 20
50 - 60
80 - 85
Main product in calcium carbide-water reaction is
Ca(OH)2
C2H2
CO2
CaCO3
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
Plasticisers are added to paints to
Make it corrosion resistant
Make glossy surface
Give elasticity & prevent cracking of the film
Increase atmospheric oxidation
Which of the following is an endothermic reaction?
Absorption of SO3 in 98% H2SO4
C + H2O = CO + H2
Thermal dissociation of iron pyrites
Both (B) and (C)
Catalytic oxidation of toluene produces
Styrene
Phenol
Benzene
Tri-nitro-toluene
__________ of quicklime produces slaked lime.
Hydration
Dehydration
Hydrogenation
None of these
The basic difference between vegetable oils and fats is in their
Density
Chemical properties
Physical state
Composition
Pick out the wrong statement.
Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%
Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98%
75% oleum can be produced by distillation of 20% oleum
Contact process of sulphuric acid manufacture uses nickel as the catalyst
Nylon-6 as compared to Nylon-66 is having higher
Hardness
Abrasion/resistance
Melting point
None of these
Haemoglobin is a/an
Amino acid
Biological catalyst
Protein
Enzyme