Styrene is produced from ethyl benzene by the process of
Dehydrogenation
Oxidation
Alkylation
Dehydration
Correct Answer :
A. Dehydrogenation
Related Questions
Which of the following is not an abrasive material?
Bakelite
Pumice
Corundum
Carborundum
The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.
Exothermic
Endothermic
Catalytic
Autocatalytic
Lindane is
Not a fumigant
BHC (Benzene Hexachloride) containing 99% γ-isomer
A by-product of BHC manufacture
Both (B) and (C)
Calcareous & argillaceous materials are used in the manufacture of
Lead
Cement
Carbon disulphide
None of these
Cellulose percentage in bamboo fibre is about
10
20
50
85
What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell?
Cl2 & Na
Cl2 & H2
O2 & H2
Cl2, H2 & NaOH solution
Industrial production of chloroform requires acetone and
Phosgene
Calcium hypochlorite
Chlorine
Ammonium chloride
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
Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
Pyrolysis of oil
Sintering of porous catalyst
Hydrogen embrittlement
All (A), (B) and (C)
Bisphenol A is produced by the condensation of acetone with
Formaldehyde
Ethyl alcohol
Diethyl ether
Phenol
The process involved in converting rubber into a thin sheet or coating it on fabric is called
Extrusion
Mastication
Calendaring
Vulcanisation
Which of the following is used as a coagulant in treating turbid water?
Chlorine
Ferric sulphate
Calcium sulphate
Activated carbon
Massecuite is a terminology used in the __________ industry.
Paint
Oil hydrogenation
Soap
Sugar
Phthalic anhydride is used
In making PVC
As plasticisers
In insecticides manufacture
For making nylon-6
Addition of calcium oxide to water produces
Exothermic heat
Hissing sound
Slaked lime
All (A), (B) & (C)
Portland cement consists mainly of
CaO & SiO2
SiO2 & Al2O3
CaO & Al2O3
CaO & Fe2O3
Main constituents of cotton fiber is
Lignin
Cellulose
Starch
Gelatine
__________ of quicklime produces slaked lime.
Hydration
Dehydration
Hydrogenation
None of these
Thermosetting plastic materials
Can be repeatedly melted
Is useful for melt casting
Cannot be melted after forming
Is useful for spinning
Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is __________ percent.
10
50
80
95
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
For the hydrogenation of oils, __________ (i) __________ is commonly used as catalyst and __________ (ii) __________ is a catalyst poison.
(i) platinum (ii) sulphur
(i) palladium (ii) oxygen
(i) nickel (ii) sulphur
(i) nickel (ii) oxygen
Hydrocyanic acid (HCN) is used as an insecticide for
Controlling timber degradation by ants
Controlling poultry lice
Potato beetle
Citrus fruits
__________ is produced by the dehydrogenation of ethyl benzene.
Styrene
Ethyl alcohol
Cumene
Phenol
Sea water contains about __________ ppm of bromine.
5
70
500
1700
Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
Calcium sulphate
Sodium chloride
Sodium sulphate
Magnesium chloride
How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
500°C
750°C
1000°C
1500°C
Pick out the correct statement.
A fat is converted into oil by its hydrogenation
There is no difference between a fat and an oil so far as its physical properties are concerned
All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms
Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content
Temporary hardness of water can be removed by
Addition of alum (a coagulant)
Boiling
Filtration (through gravity sand filter)
Addition of lime
Liquefaction of gases cannot be done by
Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Merely compressing it beyond critical pressure
Adiabatic expansion against a piston or in a turbine