Related Questions

If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 13 : 42
B 19 : 43
C 15 : 42
D 17 : 43
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
A Sheradising
B Parkerising
C Anodising
D None of these
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
If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 17 : 43
B 13 : 42
C 19 : 43
D 15 : 42
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is
A Reduced preferentially
B Cheaper
C Oxidised preferentially
D Lighter
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
Among the following, carbonate ore of Zinc is
A Zinc blende
B Calamine
C Sphalerite
D Zincite
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

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