Cement setting under water employs a/an __________ process.
Hydration
Decomposition
Oxidation
Reduction
Correct Answer :
A. Hydration
Related Questions
Which is a high grade pulp?
Rag pulp
Mechanical pulp
Sulphate pulp
Sulphite pulp
Neoprene is chemically known as
Polybutadiene
Styrene butadiene rubber (SBR)
Polyurethane
Polychlorophrene
Which of the following sugars is the sweetest?
Glucose
Fructose
Sucrose
Lactose
SO2 is bubbled through hot sugar cane juice to
Act as an acidifying agent
Increase its concentration
Increase the amount of molasses
Increase the crystal size
Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene?
AgO
Al2O3
ZnCl2
Fe2O3
Na2CO3 is called
Washing soda
Soda ash
Plaster of Paris
Calcite
Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces
Nylon-6
Dacron
Polyester
PVC
The most stable allotropic form of phosphorous is the __________ phosphorous.
White
Black
Yellow
Red
Viscose rayon is chemically
Cellulose nitrate
Regenerated cellulose nitrate
Cellulose acetate
Regenerated cellulose acetate
Function of thinner in a paint is to
Accelerate the oxidation of oil
Prevent gelling of the paint
Suspend pigments & dissolve film forming materials
Form a protective film
Systemic insecticides
Are absorbed throughout the plant
Kill insects following external bodily contact
Are stomach poisons
Emit poisonous vapour
Zeolite is used in the
Water treatment
Glass manufacture
Hydrogenation of fatty oil as a catalyst
Development of exposed photographic plate
Catalyst used during the manufacture of 'Vanaspati Ghee' is
Zinc
Nickel
Platinum
Copper
Which of the following is not an abrasive material?
Bakelite
Pumice
Corundum
Carborundum
Which oil is preferred for paint manufacture?
Drying oil
Non-drying oil
Semi-drying oil
Saturated oil
Reaction of an alcohol with organic acid is called the __________ reaction.
Saponification
Esterification
Neutralisation
Acidification
Pick out the wrong statement.
Fibrillation of fibre during paper manufacture is done to develop the strength in paper
Alkali consumption in digestion/cooking of bamboo is measured in terms of permanganate number
Bagasse fibre contains both lignin & cellulose
Presence of sodium sulphate in pulp makes the pulp bleachability poor
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
Slaked lime
Soda lime
Calcium perchlorate
None of these
Which of the following paper does not require a filler during manufacture?
Bond paper
Writing paper
Blotting paper
Coloured paper
Chemical name of soda ash is
Sodium bicarbonate
Sodium thiosulphate
Potassium carbonate
None of these
Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is __________ percent.
10
50
80
95
Catalytic oxidation-dehydrogenation of methyl alcohol produces
Formaldehyde
Phenol
Acetone
Maleic anhydride
Cation exchanger is regenerated usually with
NaOH
H2SO4
Hydrazine
Alum solution
Alum is commercially produced from
Gypsum
Feldspar
Galena
Bauxite
Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
Nickel
Vanadium
Alumina
Iron
Sucrose content in cane sugar may be around __________ percent.
50
70
95
80
Economics of 'Solvay Process' depends upon the efficiency of
Carbonating tower
Ammonia recovery
Ammonia recovery and size of the plant
Ammoniation of salt solution
Dichloro diphenyl __________ is the full form of DDT (an insecticide).
Tetrachloroethane
Trichloroethane
Tetrachloromethane
Trichloromethane
The chamber process is
Preferred over contact process for producing 98 to 100% H2SO4 and various oleums
Non-catalytic and operates only on pyrites
A batch process for directly producing high strength (98 to 100%) H2SO4
None of these
The main use of HCl is in the
Drilling of petroleum wells and pickling of steel sheets
Manufacture of cationic detergent
Treatment of spent fuel of nuclear reactor
None of these