Fermentation is adversely affected by the
Presence of air
Absence of air
High concentration
Presence of ammonium salts
Correct Answer :
C. High concentration
Related Questions
Addition of calcium oxide to water produces
Exothermic heat
Hissing sound
Slaked lime
All (A), (B) & (C)
Caprolactam (a raw material for nylon-6 manufacture) is produced from
Phenol
Naphthalene
Benzene
Pyridine
Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.
-83
-183
-196
-218
Main constituent of limestone is
CaCO3
MgCO3
Na2CO3
CaSO4
In industrial nomenclature, alcohol means
Butyl alcohol
Propyl alcohol
Ethanol
Methyl alcohol
Presence of H2S in raw water (to be chlorinated) results in the
Reduced softening capacity of zeolite
Increased dosage of chlorine to provide a disinfecting residual in the water
Easy removal of its hardness
None of these
Widely used method for the conditioning of boiler feed water is the
Cold lime process
Coagulation
Hot-lime soda process
Sequestration
Nylon-6 is manufactured from
Caprolactam
Hexamethylene diamine and adipic acid
Hexamethylene diamine and Maleic anhydride
Hexamethylene diamine and Sebacic acid
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
Stereospecific agents are exemplified by
Radiation
Supported metal oxide catalysts
Ziegler catalysts
All (A), (B) & (C)
Triple superphosphate is manufactured by reacting
Phosphate rock with phosphoric acid
Phosphate rock with sulphuric acid
Phosphate rock with nitric acid
Ammonium phosphate with phosphoric acid
Which oil is preferred for paint manufacture?
Drying oil
Non-drying oil
Semi-drying oil
Saturated oil
Which of the following is an ore of iron?
Galena
Chalcopyrite
Hematite
Bauxite
Extraction of __________ employs an electrolytic process.
Aluminium
Silver
Copper
All (A), (B) and (C)
Carborundum consists mainly of
Bauxite
Silicon carbide
Boron carbide
Calcium carbide
Plaster of Paris is
CaSO4. ½H2O
Used for setting of broken bones
Both (A) and (B)
Same as gypsum
Which is a high grade pulp?
Rag pulp
Mechanical pulp
Sulphate pulp
Sulphite pulp
Raw material used in alcohol distilleries in India is
Molasses
Benzol
Methylated spirit
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
Epoxy resin
Is a good adhesive
Is an elastomer
Cannot be used for surface coatings
Is a polyester
Graphite is a/an
Electrical insulator
Allotrope of carbon
Moderator used in nuclear reactor
Both (B) and (C)
Glass is
Mainly CaO
Subjected to galvanising
A super cooled liquid
All (A), (B) and (C)
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
Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like
High cost
Fragile nature
Easy poisoning tendency
All (A), (B) and (C)
The amount of benzene present in pure Benzol is about __________ percent.
30
50
70
90
Massecuite is
Used for paper making
Used as a cattle feed
Highly acidic in nature
None of these
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
Absorption of SO3 in 97% H2SO4 is
Exothermic
Endothermic
Not possible
None of these
Esterification reaction
Produces soap
Is reversible
Is a reaction between an alcohol and an organic acid
All (A), (B) and (C)
Commonly used glass is known as the __________ glass.
Flint
Hard
Pyrex
Soda