__________ glass is used for the manufacture of optical glass.
Pyrex
Soda
Flint
Crooke's
Correct Answer :
C. Flint
Related Questions
Commercial production of calcium carbide requires limestone and __________ as raw materials.
Coke
Sand
Soda ash
Fuel oil
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
Pick out the wrong statement.
Dry process is used for the manufacture of cement, when the raw material is blast furnace slag
Portland cement is made employing wet process
Gypsum is added to Portland cement to lengthen its setting time
None of these
__________ is an ore concentrating metallurgical process involving a chemical change.
Electromagnetic separation
Froth floatation
Roasting
None of these
The amount of benzene present in pure Benzol is about __________ percent.
30
50
70
90
The purpose of tanning in leather industry is to
Stiffen the leather
Smoothen the leather
Make it flexible
Impart water resistance
Vegetable oils and fats basically differ in their
Density ranges
Physical state
Chemical composition
Chemical properties
Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.
80
90
98
100
Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.
Endothermic
Exothermic
Irreversible
Both (B) and (C)
H2S is scrubbed from refinery gases by absorption using
Dilute H2SO4
Ethanol amine
Chilled water
Tri-butyl phosphate
Ordinary glass is not a/an
Amorphous isotropic material
Supercooled liquid
Material with sharp definite melting point
Electrical insulator
Sulphur removal by heating of pyrite ore in presence of air is called its
Reduction
Roasting
Calcination
Smelting
Which of the following is not produced on commercial scale from sea water?
Bromine
Magnesium compounds
Potassium compounds
Sodium sulphate
Superior quality laboratory apparatus is made of the __________ glass having low thermal coefficient of expansion & high chemical resistance.
Flint
Soda
Pyrex
Potash
P.T.F.E. (Poly tetra fluoro ethylene) is commercially known as
Bakelite
Neoprene
Teflon
Nylon-66
Viscose rayon
Cannot be made from sulphite pulp
Utilises H2SO4, NaOH and CS2 during its manufacture
Cannot yield textile grade fibre
None of these
Dense soda ash used in the manufacture of glass, is chemically represented by
Na2CO3
Na2CO3.10H2O
Na2CO3.H2O
Na2HCO3
Bromine content in sea water may be around __________ ppm.
70
640
1875
2500
Penicillin is made employing __________ fermentation process.
Continuous
Aerobic batch
Anaerobic batch
None of these
Common salt is generally not produced commonly by __________ method from brine.
Freeze drying
Electrolytic
Solar evaporation
Vacuum evaporation
Heating of __________ to 120°C, produces plaster of paris.
Blue vitriol
Gypsum
Calcium silicate
Calcium sulphate
Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively
V2O5 & Cr2O3.
Oxides of nitrogen & Cr2O3
V2O5 on a porous carrier & oxides of nitrogen
Oxides of nitrogen & V2O5 on a porous carrier
L.D. converter is used in the production of
Pig iron
Steel
Copper
Zinc
Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
70
55
80
94
Cellulose percentage in bamboo fibre is about
10
20
50
85
A unit operation is exemplified by the process of
Reduction
Desorption
Nitration
Combustion
Cement setting under water employs a/an __________ process.
Hydration
Decomposition
Oxidation
Reduction
The most stable allotropic form of phosphorous is the __________ phosphorous.
White
Black
Yellow
Red
In the Lurgi coal gasifier
Coking coals cannot be used
Low carbon conversion efficiency is achieved
Entrainment of solids is higher
Large quantity of coal can be processed
Solvay process is used for the manufacture of
Caustic soda
Soda ash
Caustic potash
Soda lime