Important ore of Mg is
Gypsum
Carnallite
Magnatide
The purest zinc is made by
The Mond process
Bessemer process
Zone refining
Electrolytic refining
Bauxite is an ore of :
Iron
Nickel
Copper
Aluminium
In forth floatation process for the purification of ores the particles of ore float because.
Their surface is not easily wetted by water.
They are light
They are insoluble
They bear electrostatic charge.
Which element has the largest abundance in the earth’s crust?
Calcium
Magnesium
Sodium
Impurities present in then ore react to form a fusible substance known as.
Flux
Gangue
Nugget
Mineral
Which one of the following is malachite ore of copper?
Cu2O
Cu2S
CuFeS2
Cu(OH)2 . CuCo3
Nickel can be refined by ________method.
Carbonyl
Chemical
Froth floatation method
__________ is an example for oxide ore.
Cinnabar
Tinstone
Zinc blende
Copper pyrites
Bauxite is :
Na2 . AlF6
Al2O3 .2H2O
2CaCo3 . Cu(OH)2
