DDT should not be allowed to come in contact with iron (during its manufacture) to
Avoid its decomposition
Prevent sulphonation of the monochlorobenzene by the acid catalyst
Achieve non-hygroscopic property
None of these
Correct Answer :
A. Avoid its decomposition
Related Questions
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as
It is very corrosive at elevated temperature
Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
It decomposes on further increasing the temperature
None of these
The amount of benzene present in pure Benzol is about __________ percent.
30
50
70
90
Dechlorination of treated water is necessary to
Remove residual turbidity
Reduce the bacterial load on filter
Control taste and odour
Remove chlorinous taste
Calcareous & argillaceous materials are used in the manufacture of
Lead
Cement
Carbon disulphide
None of these
Frasch process is for
Making oxygen
Producing helium
Mining sulphur
Making nitrogen
Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C.
-5 to 0
5 to 10
30 to 50
75 to 80
Most widely and commonly used coagulant for the removal of suspended impurities in water is
Bleaching powder
Slaked lime
Alum
Copper sulphate
Sulphuric acid is mainly used in the __________ industry.
Fertiliser
Steel
Paper
Paint
Terylene is
Same as Dacron
A polyester
Both (A) & (B)
Neither (A) nor (B)
Haemoglobin is a/an
Amino acid
Biological catalyst
Protein
Enzyme
Hydrazine is used in water treatment for the removal of
Colloidal impurities
Dissolved oxygen
Turbidity
Chlorinous taste
Presence of carbonaceous matter in the sewage
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
Increases the quantity of chlorine used for its purification
All (A), (B) and (C)
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?
Xanthates
Stearic acid
Calcium & aluminium stearate
Formic acid
Na2CO3.10H2O is called
Washing soda
Soda ash
Slaked lime
Quicklime
Pick out the wrong statement.
Low intensity explosives are also called propellants, whereas high intensity explosive are called detonators
Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur
Lead azide is a popular military explosive
TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being
Chemical name of aspirin (an analgesic drug) is
Acetylsalicylic acid
Nictonic acid
Calcium acetate
Methyl salicylate
Common salt is generally not produced commonly by __________ method from brine.
Freeze drying
Electrolytic
Solar evaporation
Vacuum evaporation
The difference between saponification value and acid value is
Called ester value
Always negative
Constant for all fatty oils
None of these
Catalyst used during the manufacture of 'Vanaspati Ghee' is
Zinc
Nickel
Platinum
Copper
Comparing sulphate process with sulphite process, we find that __________ in the later.
Both temperature & pressure in the former is less than that
Both temperature & pressure in the former is more than that
Temperature is more in the former whereas pressure is more
Pressure is more in the former whereas temperature is less
Penicillin is separated from fermented broth by
Extraction with amyl or butyl acetate
Ternary Azeotropic distillation
Evaporator in calandria
Extractive distillation
__________ of rubber decreases after its vulcanisation.
Resistance to the action of organic solvent
Tackiness
Maximum service temperature
Tensile strength
Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.
75
< 10
> 30
50
The noble gas which occurs most abundantly in the atmosphere is
Helium
Neon
Krypton
Argon
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
In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because
SO3 gas is sparingly soluble in water
Water forms an acid mist, which is difficult to absorb
The purity of acid is affected
Scale formation in the absorber is to be avoided
Analgesic drugs are
Pain relievers
Antibiotics
Used in the treatment of T.B.
Used in the treatment of typhoid
Nylon-66 is so named because the
Average degree of polymerisation of the polymer is 1966
Number of carbon atoms between two nitrogen atoms are 6
Number of nitrogen atoms between two carbon atoms are 6
Polymer was first synthesised in 1966
__________ paper is used in the manufacture of newsprint paper.
Ground-wood
Board
Tissue
Wrapping
Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.
Emulsification
Dispersion
Precipitation
Wetting