Dechlorination of treated water is necessary to
Remove residual turbidity
Reduce the bacterial load on filter
Control taste and odour
Remove chlorinous taste
Correct Answer :
D. Remove chlorinous taste
Related Questions
The most commonly used substance to speed up the sedimentation of sewage is
Lime
Sulphuric acid
Chlorine
Sodium bisulphite
Lurgi coal gasifier is a pressurised __________ bed reactor.
Moving
Fixed
Fluidised
Entrained
Wax is a
Mixture of glycerides
Mixture of esters of polyhydric alcohols excepting glycerine
Liquid at room temperature
Mixture of glycerides of fatty acids
Commonly used glass is known as the __________ glass.
Flint
Hard
Pyrex
Soda
In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
Diamine and the ring
Dibasic acid and the ring
Diamine and the dibasic acid
None of these
Pick out the exothermic reaction out of the following:
C + H2O = CO + H2
CaC2 + H2O = Ca(OH)2 + C2H2
MgCO3 = MgO + CO2
All (A), (B) and (C)
Neoprene is a
Monomer
Synthetic rubber
Polyester
None of these
Contact process of sulphuric acid manufacture
Yields acid of higher concentration than chamber process
Yields acids of lower concentration than chamber process
Is obsolete
Eliminates absorber
Chemical formula of oleum is
H2SO3
H2SO4
H2S2O7
H2SO7
Ethanol amine is produced using ammonia and
Ethyl benzene
Ethylene oxide
Ethanol
Ethane
Permanent hardness of water can be removed by
Simply boiling
Adding alum
Passing it through cation & anion exchangers
All (A), (B) and (C)
The major constituent of black liquor generated during paper manufacture is sodium
Sulphate
Carbonate
Hydroxide
Bi-carbonate
The type of high refractive index glass used in optical instruments is __________ glass.
Pyrex
Flint
Crookes
None of these
Esterification reaction produces
Detergent
Vanaspati
Soap
Mercaptans
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)
Extraction of __________ employs an electrolytic process.
Aluminium
Silver
Copper
All (A), (B) and (C)
An alkali metal salt of Palmitic acid is known as
Soap
Metallic soap
Detergent
Alkaloid
Yellow phosphorus is transported under
Air
Water
Nitrogen
Helium
Which one of the following is not an elastomer?
Polyisoprene
Neoprene
Nitrile-butadiene
None of these
Hydrazine is largely used
As a starting material for 'hypo'
In photographic industry
As rocket fuel
In printing industry
10% oleum comprises of 10% free
SO2
H2SO3
SO3
H2SO4
Varnish does not contain
Thinner
Pigment
Both (A) & (B)
Neither (A) nor (B)
Viscose rayon is chemically
Cellulose nitrate
Regenerated cellulose nitrate
Cellulose acetate
Regenerated cellulose acetate
Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of
Nitric acid
Hydrochloric acid
Methyl alcohol
Formic acid
Bleaching of paper pulp is done with
Activated clay
Bromine
Chlorine or chlorine dioxide
Magnesium sulphite
Which of the following is used as a binding material in soap to improve soap texture?
Rosin
Borax
Benzyl acetate
Sodium carbonate
The major constituents of glass are
Lime, clay and soda ash
Sand, lime and soda ash
Silica, alumina and clay
Silica, alumina and soda ash
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)
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
Baking soda is chemically represented by
Na2CO3
NaHCO3
Na2CO3.H2O
Na2CO3.10H2O