Nickel can be refined by ________method.
Carbonyl
Zone refining
Chemical
Froth floatation method
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.
Copper is extracted form its ore by :
Electrolytic reduction
Auto reduction
Cyanide process
Magnetic separation
Scientific and technological process used for isolation of the metal from its ores is known as
Metallurgy
Metallica
Metallography
None of these
Which of the following ores is an ore of copper?
Argentite
Hematite
Malachite
Calamine
The slag formed in extraction of copper is
CuFeS2
Cu20 + Fe S
Cu2S + FeO
Fe SiO3
