Essential oils are usually obtained using
Steam distillation
Extractive distillation
Solvent extraction
Leaching
Correct Answer :
D. Leaching
Related Questions
Addition of calcium oxide to water produces
Exothermic heat
Hissing sound
Slaked lime
All (A), (B) & (C)
Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine?
Na2CO3
NaHCO3
H2
None of these
Which allotrope of sulphur is insoluble in carbon disulphide?
Rhombic sulphur
Monoclinic sulphur
Plastic sulphur
Milk of sulphur
The process involved in converting rubber into a thin sheet or coating it on fabric is called
Extrusion
Mastication
Calendaring
Vulcanisation
Nitric acid is not used in the manufacture of
Detergents
Fertilisers
Aqua regia
Explosives
Sucrose content in cane sugar may be around __________ percent.
50
70
95
80
Hard water
Does not affect the lather formation by soap
Is not unfit for drinking purpose
Pollutes the water stream
All (A), (B) and (C)
Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of
Carbon
Arsenic
Lead
Sulphur
Styrene is produced from ethyl benzene by the process of
Dehydrogenation
Oxidation
Alkylation
Dehydration
Hydrogenation of oil takes place in a/an __________ reactor.
Autothermal
Trickle bed
Plug flow
None of these
Sulphuric acid completely saturated with sulphur trioxide is called
Concentrated sulphuric acid
Oleum
Sulphurous acid
Dilute sulphuric acid
Transparent soaps (e.g. Pears) are
Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
Metallic soaps with frothing agent and free Stearic acid to achieve transparency
Metallic soaps with frothing agent from which glycerine has not been recovered
None of these
Prussian blue is chemically represented by
FeO.TiO2
Ca SO4 . 2H2O
Fe4 [Fe (CN6)3]
AlF3 . 3NaF
The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.
Exothermic
Endothermic
Catalytic
Autocatalytic
Chemical formula of 'salt cake' is
Na2SO4
CaSO4
MgSO4
BaSO4
Commercially ethylene is produced from naphtha by
Catalytic cracking
Catalytic dehydrogenation
Pyrolysis
Hydrocracking
Highly porous refractory bricks are
Less susceptible to chemical attack by molten fluxes and gases etc
Very strong
Having very high thermal conductivity
None of these
Rotary kiln is not involved in the production of
Cement
Lime from limestone
Slaked lime from quick lime
None of these
Solvent extracted oil
Has low free fatty acid content
Is odourless
Has more of unsaturates
None of these
High temperature carbonisation of coal produces
Inferior coke compared to low temperature carbonisation
Less of gases compared to liquid products
Larger quantity of tar compared to low temperature carbonisation
None of these
Which of the following is not required in the manufacture of soda ash by Solvay process?
Ammonia
Limestone
Nitric acid
None of these
Molecular weight of plastics ranges from
5000 to 10000
20000 to 250000
500 to 5000
106 to 109
20% oleum means that in 100 kg oleum, there are 20 kg of
SO3 and 80kg of H2SO4
H2SO4 and 80kg of SO3
SO3 for each 100 kg of H2SO4
None of these
Naphthols are derivates of
Methyl amine
Naphthalene
Phenol
Xylene
Neoprene is a
Monomer
Synthetic rubber
Polyester
None of these
Fermentation is adversely affected by the
Presence of air
Absence of air
High concentration
Presence of ammonium salts
Cation exchanger is regenerated usually with
NaOH
H2SO4
Hydrazine
Alum solution
Which of the following is not an insecticide?
Hydrocyanic acid
Nicotine
Sodium fluoride
Hexane
99.5% purity oxygen is used in
Cutting and welding by oxy-acetylene flame
Hospitals for medicinal purposes
Gas masks and artificial breathing apparatus
All (A), (B), and (C)
Sodium salt of higher molecular weight fatty acid is termed as the __________ soap.
Hard
Soft
Metallic
Lubricating