__________ is used as a flux in the smelting of copper ore like chalcopyrite.
Coke breeze
Lime powder
Silica/quartz
Dolomite
Correct Answer :
C. Silica/quartz
Related Questions
Reverse osmosis is normally used for the
Separation of isotopes of uranium from gaseous uranium hexafluoride
Separation of helium from natural gas
Desalination of brackish water to produce potable (drinking) water
Purification of oxygen
Lithophane is
Explosive
White lead
Filter aid
ZnS (white pigment)
Fat splitting catalyst is
CaCO3
ZnO
Al2O3
Fe
__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.
Chlorine
Ammonium chloride
Sodium carbonate
Sodium bi-carbonate
Glycerine is a by-product of the __________ industry.
Soap
Detergent
Oil hydrogenation
Paint
Hydrazine is used in water treatment for the removal of
Colloidal impurities
Dissolved oxygen
Turbidity
Chlorinous taste
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)
Paper grade bamboo contains about __________ percent cellulose.
5
20
40
60
Black liquor is converted into white liquor by
Evaporation and burning the concentrate followed by causticisation of products
Multi-effect evaporation only
Selective liquid extraction
Extractive distillation
Pick out the false statement pertaining to water treatment.
Aeration of water is effective in CO2 removal
The zeolite water softening process reduces the hardness of water by not more than 50%
Sodium sulphate or sodium carbonate do not cause hardness in water
Water with pH value less than 7, is acidic
Dacron is a
Condensation product of Hexamethylene diamine and adipic acid
Thermosetting material
Condensation product of dimethyl terephthalate and ethylene glycol
None of these
Synthetic glycerine is produced from
Toluene
Phenol
Propylene
Naphthalene
Which of the following is a constituent of vinegar?
Around 10% alcohol
Around 1% acetic acid
Both (A) and (B)
Neither (A) nor (B)
A substance produced by a living organism and capable of anti-microbial activity is called a/an
Antibiotic
Antiseptic
Disinfectant
None of these
Poly Tetrafluoroethylene (P.T.F.E.) is known as
Bakelite
Teflon
Celluloid
Dacron
Permanent hardness of water is due to the presence of calcium & magnesium
Bi-carbonates
Sulphates & chlorides
Carbonate
None of these
Fire clay is __________ refractory material.
A basic
An acidic
A neutral
Not a
Catalytic oxidation-dehydrogenation of methyl alcohol produces
Formaldehyde
Phenol
Acetone
Maleic anhydride
Dry ice (solidified CO2) is used for the
Storage & shipment of frozen foods and ice-creams
Liquefaction of permanent gases
Liquefaction of natural gas
None of these
Main constituents of cotton fiber is
Lignin
Cellulose
Starch
Gelatine
__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.
Phosphates
Chromates
Sulphates
Bi-carbonates
Metallic soap is __________ salt of fatty acids.
Sodium
Potassium
Both sodium & potassium
Aluminium or calcium
Fourdrinier machine is used in the manufacture of
Sugar
Paper
Alcohol from molasses
Phenol formaldehyde
Which of the following is a detergent?
Benzene hexachloride
Alkyl benzene sulphonate
Polytetrafluoroethylene
Cellulose nitrate
Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the
Fertiliser manufacture
Car battery solution
Synthesis of oleum
Water treatment
Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
70
55
80
94
The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is
Dilute H2SO4
Oleum
Ultraviolet light
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)
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)
Electric bulbs are made of __________ glass.
Jena
Flint
Crookes
Pyrex