Bleaching of paper pulp is done with
Activated clay
Bromine
Chlorine or chlorine dioxide
Magnesium sulphite
Correct Answer :
C. Chlorine or chlorine dioxide
Related Questions
Reaction of calcium carbide with water produces a gas, which is used
As an illuminant
For metal cutting/welding
Both (A) & (B)
Neither (A) nor (B)
Commercially ethylene is produced from naphtha by
Catalytic cracking
Catalytic dehydrogenation
Pyrolysis
Hydrocracking
Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction
Decreases with decrease of thickness of the flakes
Increases with the increasing flake size keeping the flake thickness constant
Increases considerably with the rise of temperature
Decreases as the moisture content of flakes increases
Cumene is the starting material for the production of
Benzoic acid
Phenol and acetone
Isoprene
Styrene
Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
70
55
80
94
P.T.F.E. (Poly tetra fluoro ethylene) is commercially known as
Bakelite
Neoprene
Teflon
Nylon-66
The terminology 'BTX' used in coal tar distillation industry refers to
Benzol-toluol-xylol
Benzol-toluene-xylene
Benzene-toluol-xylol
Benzene-toluene-xylene
Diaphragm electrolytic cell as compared to mercury electrolytic cell
Produces 70% NaOH solution
Requires less specific power consumption for the production of chlorine
Requires lesser investment for similar capacity
All (A), (B) and (C)
High acid value of an oil or fat is an indication of
Storage under improper conditions
Absence of unsaturation
Its smaller molecular weight
None of these
The type of high refractive index glass used in optical instruments is __________ glass.
Pyrex
Flint
Crookes
None of these
Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
25
60-70
150-200
250-300
Pick out the wrong statement.
Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action
Soap powder is prepared by mixing soap with hydrated sodium carbonate
Detergents differ from soaps in their action in hard water
Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc
Fermentation is adversely affected by the
Presence of air
Absence of air
High concentration
Presence of ammonium salts
Which of the following is the second major component of cement?
Al2O3
CaO
SiO2
Fe2O3
Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
Nickel
Vanadium
Alumina
Iron
Hydrogenation of oil takes place in a/an __________ reactor.
Autothermal
Trickle bed
Plug flow
None of these
The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.
Cationic
Anionic
Amphoteric
Semi polar
High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to
Flocculate the impurities
Facilitate fast filtration
Both (A) and (B)
Neither (A) nor (B)
The most reactive allotropic form of phosphorus is __________ phosphorus.
Red
Yellow
Violet
Black
Isopropyl benzene produced by alkylation of benzene with propylene is known as
Neoprene
Cumene
Gelatin
Mercaptans
Pure rectified spirit contains about __________ percent alcohol.
45
70
95
99.5
Caprolactam (a raw material for nylon-6 manufacture) is produced from
Phenol
Naphthalene
Benzene
Pyridine
DDT stands for
Diethyl-diphenyl-trichloromethane
Dichloro-diphenyl-trichloromethane
diphenyl-dichloro-trichloromethane
Dichloro-diphenyl-trichloroethane
Which of the following, when pyrolysed, produces Perchloroethylene?
Ethylene dichloride
Chlorobenzene
Carbon tetrachloride
Chlorinated paraffin
Titanium dioxide is a/an __________ colour pigment.
White
Black
Yellow
Blue
Soap cannot be used with hard water, because
Hard water contains sulphate
They form insoluble calcium soaps which precipitate
They attract back the removed dirt
None of these
Shrinkage volume in cement setting does not depend upon the
Sand to cement ratio
Water to cement ratio
Ambient temperature fluctuation
Drying period
Use of water having dissolved oxygen in boilers promotes
Corrosion
Sequestration
Scale formation
None of these
Which of the following is an endothermic reaction?
Absorption of SO3 in 98% H2SO4
C + H2O = CO + H2
Thermal dissociation of iron pyrites
Both (B) and (C)
Average sulphur content in Indian pyrites is about __________ percent.
15
35
55
70