Related Questions

In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :
A Jet of water at high pressure
B Blast of air
C Mixture of water and air
D Rain of molten lead
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when
A Extracting solvent is cheaply & abundantly available
B One of the liquid components is heat sensitive
C Viscosity of liquid components is very high
D One of the liquid components has very high affinity towards the solvent
Extraction of pencillin employs a __________ extraction coloumn.
A Centrifugal
B Packed
C Plate
D None of these
With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)
A Increases
B Decreases
C Remains unaffected
D Increases Linearly
__________ is used as a flux in the smelting of copper ore like chalcopyrite.
A Coke breeze
B Lime powder
C Silica/quartz
D Dolomite
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
A 1800
B 2200
C 2400
D 2700
Smelting is the process of
A Removing the impurities like clay, sand etc. from the iron ore by washing with water
B Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
C Reducing the ore with carbon in the presence of a flux
D All of the above
During smelting process, the combination of fuel in the furnace
A Forms carbon dioxide
B Carbon dioxide with carbon forms carbon mono-oxide
C Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
D All the above
Flux addition during smelting of ore is done to
A Remove impurities/gangue
B Enhance rate of reaction
C Accelerate reduction of ore
D Separate slag from metal
Which of the following parts of the poppy plant is used for the extraction of opium?
A Capsules
B Flowers
C Leaves
D Roots

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