Related Questions

Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?
A Copper
B Mercury
C Lead
D None of these
Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ?
A Copper
B Zinc
C Both A & B
D Neither A nor B
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
A granite
B basalt
C igneous rocks
D sedimentary rocks
Which of the following is the correct order of reactivity of metals?
A Zn > Mg > Fe > Cu > Ag
B Zn > Mg > Fe > Ag > Cu
C Mg > Zn > Fe > Ag > Cu
D Mg > Zn > Fe > Cu > Ag
Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
A Cresylic acid
B Xanthaies
C Pine oil
D All of the above
Dietus-Boelter equation cannot be used for molten metals mainly due to its very low
A Prandtl number
B Grashoff number
C Thermal conductivity
D Viscosity
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
A liquation
B leaching
C levigation
D magnetic separation
Ore concentration by froth floatation utilises the __________ of ore particles.
A Density difference
B Wetting characteristics
C Terminal velocities
D None of these
Leaching of uranium ore and gold ore is done in
A Centrifugal extractor
B Pachuka tanks
C Bollman extractor
D None of these
The high reactivity of fluorine is due to
A its high electro negativity
B small size of fluorine atom
C availability of d-orbitals
D strong F - F bond

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