High temperature carbonisation of coal takes place at __________ °C.
2000
700
1100
< 500
Correct Answer :
C. 1100
Related Questions
Thorium is mainly used
For the manufacture of gas mantles
As a fissile fuel in a nuclear reactor
In the manufacture of hydrogen bomb
In the treatment of cancer
The difference between saponification value and acid value is
Called ester value
Always negative
Constant for all fatty oils
None of these
Sizing material is incorporated in paper to
Impart resistance to penetration by liquids
Increase its thickness
Increase its flexibility & opacity
Increase its brightness
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
Slaked lime
Soda lime
Calcium perchlorate
None of these
The biochemical treatment applied to sewage effluents is a process of
Dehydration
Reduction
Oxidation
Polymerisation
Carboxymethyl cellulose (CMC) is added in detergents to
Prevent redeposition of soil on cleaned surface
Act as optical brightening agent
Inhibit corrosion in washing machines made of aluminium
None of these
Conversion of CO to CO2 by steam in presence of a catalyst is called
Steam reforming
Shift conversion
Steam gasification
None of these
Alcohol is produced by the
Oxidation of an aldehyde
Hydrolysis of an ether
Esterification of a fat
None of these
Yellow phosphorus is transported under
Air
Water
Nitrogen
Helium
Neon gas is
Flammable in nature
Used in color discharge tube
Filled in lamps having tungsten filament
All (A), (B) and (C)
Helium is produced on commercial scale from
Air
Natural gas
Coke oven gas
None of these
Fish contains about __________ percent oil.
5
10
20
35
10% oleum comprises of 10% free
SO2
H2SO3
SO3
H2SO4
Trinitrotoluene (TNT), an explosive, is made by the nitration of
Nitrobenzene
Toluene
Nitrotoluene
Benzene
Producer gas consists mainly of
CO, CO2 N2, H2
CO, H2
H2, CH4
C2H2, CO2, H2
Main use of hydrazine is
As a rocket fuel
In water treatment
As a disinfectant
As fire retardant
The drug used in contraceptives is
Sulfadiazine
Mestranol
Methyl salicylate
Penicillin
Absorption of SO3 in 97% H2SO4 is
Exothermic
Endothermic
Not possible
None of these
__________ of quicklime produces slaked lime.
Hydration
Dehydration
Hydrogenation
None of these
Which of the following impurities in feed water for high pressure boiler is the most detrimental?
Silica
Dissolved oxygen
Suspended salt
Dissolved salt
Calcination of gypsum produces
Plaster of Paris
Salt cake
Nitre cake
Lime
Pasteurisation of milk means
Removal of fatty and albuminous substance from it
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
Inhibiting the growth of micro-organisms without killing them
None of these
Fermentation of molasses to produce ethyl alcohol is done at __________ °C.
20 - 30
< - 5
100 - 150
250 - 300
Pick out the wrong statement.
DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction
Chloral is obtained by the chlorination of ethyl alcohol
Insecticides acting on the insects through the respiratory system are called fumigants
Benzene hexachloride is not a contact insecticide
Which of the following is an explosive?
Nitro-glycerine
Trinitrotoluene (TNT)
Cellulose nitrate
All (A), (B), and (C)
Styrene (a monomer for the production of polystyrene) is commercially produced by
Catalytic dehydrogenation of ethyl benzene
Dehydration of ethyl alcohol followed by hydrogenation
Reacting ethylene oxide with acetaldehyde
Fermentation of starch
Neoprene is the trade name of
Polyurethane
Phenol formaldehyde
Polychlorophrene
Styrene-butadiene rubber
Hydrocyanic acid (HCN) is used as an insecticide for
Controlling timber degradation by ants
Controlling poultry lice
Potato beetle
Citrus fruits
Cement setting under water employs a/an __________ process.
Hydration
Decomposition
Oxidation
Reduction
Pick out the true statement pertaining to water treatment.
Slow sand filters can remove colour completely
Activated carbon can be used for taste & odour control without subsequent filtration
Application of activated carbon reduces the temporary hardness of water
Normally, the turbidity is removed by adding a coagulant prior to sedimentation