The most widely used coagulant for removing suspended impurities from water is
Bleaching powder
Chlorine
Calcium sulphate
Alum
Correct Answer :
D. Alum
Related Questions
The basic constituent of vegetable oils is
Triglyceride
Fatty acids
Fatty alcohol
Mono esters
__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
Pyrex
Soda lime
Lead
High silica
Which of the following, when pyrolysed, produces Perchloroethylene?
Ethylene dichloride
Chlorobenzene
Carbon tetrachloride
Chlorinated paraffin
Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
Pyrolysis of oil
Sintering of porous catalyst
Hydrogen embrittlement
All (A), (B) and (C)
Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.
7-14 and 14-30
7-14 and 40-50
14 - 30 and 40-50
10 - 20 and 40 - 50
Nylon-6 is manufactured from
Caprolactam
Hexamethylene diamine and adipic acid
Hexamethylene diamine and Maleic anhydride
Hexamethylene diamine and Sebacic acid
The catalyst used in shift converter is
Nickel
Vanadium
Silica gel
Alumina
The process involved in converting rubber into a thin sheet or coating it on fabric is called
Extrusion
Mastication
Calendaring
Vulcanisation
Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.
15-30
90-100
250-300
< 0
Rancidity of the fatty oil can be reduced by its
Decoloration
Hydrogenation
Oxidation
Purification
Calgon used in water treatment is chemically
Sodium phosphate
Sodium hexametaphosphate
Calcium phosphate
Tricresyl phosphate
Viscose rayon is chemically
Cellulose nitrate
Regenerated cellulose nitrate
Cellulose acetate
Regenerated cellulose acetate
Favourable conditions for the liquefaction of gases in general are
High pressure & low temperature
Low pressure & high temperature
High pressure & high temperature
Low pressure & low temperature
Pure rectified spirit contains about __________ percent alcohol.
45
70
95
99.5
Fermentator temperature during production of alcohol from molasses is around __________ °C.
5
30
130
300
Commercially ethylene is produced from naphtha by
Catalytic cracking
Catalytic dehydrogenation
Pyrolysis
Hydrocracking
Production of one ton of cement requires about __________ tons of limestone.
0.6
1.2
2.2
3.8
Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at
1 atm & 100°C
5 atm & 275°C
100 atm & 500°C
50 atm & 1000°C
Plasticisers are added to synthetic plastics to
Impart flexibility
Improve workability during fabrication
Develop new improved properties not present in the original resins
All (A), (B) and (C)
Phthalic anhydride is produced by the oxidation of
Naphthalene
Benzene
Toluene
Aniline
Carboxymethyl cellulose (CMC) is added in detergents to
Prevent redeposition of soil on cleaned surface
Act as optical brightening agent
Inhibit corrosion in washing machines made of aluminium
None of these
Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
70
55
80
94
Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.
CaO
MnO2
ZnO
FeS
Production of alcohol by fermentation of molasses is a/an __________ process.
Anaerobic
Aerobic
Endothermic
Both (B) and (C)
Pick out the correct statement.
A fat is converted into oil by its hydrogenation
There is no difference between a fat and an oil so far as its physical properties are concerned
All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms
Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content
Pick out the wrong statement. Iodine value of an oil or fat is
The number of grams of iodine taken up by 100 gm of oil or fat
A measure of its unsaturation
Helpful in findings its adulteration & its suitability for making soap
Independent of the type of oil, whether it is drying or non-drying
__________ is a thermosetting plastic.
Polythene
Epoxy polymer
P.V.C.
Polystyrene
Process conditions in fermentator used for production of penicillin is
25°C, 2 atm
50°C, l0 atm
30°C, 200 mm Hg (absolute)
90°C, 45 atm
__________ iron is the purest form of iron.
Cast
Wrought
Pig
High silicon
Function of sodium thiosulphate (hypo) in development of photographic film/plate is to
Brighten the faint images
Remove metallic silver
Convert silver chloride to silver
Remove unexposed silver halide