In electro refining of copper some gold is deposited at
Cathode
Electrode
Cathode mud
Anode mud
The function of flux during the smelting of the ore is :
To make the ore porous
To remove gangue
To facilitate reduction
To facilitate oxidation
The chemical composition ' slag ' formed during the smelting process in the extraction of copper is :
Cu2O + FeS
FeSiO3
CuFeS2
Cu2S + FeO
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.
__________ is an example for oxide ore.
Cinnabar
Tinstone
Zinc blende
Copper pyrites
The slag formed in extraction of copper is
Cu20 + Fe S
Fe SiO3
Which element has the largest abundance in the earth’s crust?
Aluminium
Calcium
Magnesium
Sodium
Sulphide ores are generally concentrated by :
Froth flotation
Roasting
Gravity
Reduction by carbon
In zone refining method, the molten zone
Contains impurities
Contains purified metal only
Contains more impurity than the original metal
Moves the either side
Impurities present in then ore react to form a fusible substance known as.
Flux
Gangue
Nugget
Mineral
