Which is extracted by hydro metallurgy from low grade ores?
Copper
Iron
Aluminium
Nickel
Ores are usually contaminated with earthly or undesired materials known as
flux
gangue
slag
minerals
The ore is heated in a regular supply of air in a furnace at a temperature below the melting point of the metal is called as
Calcination
Roasting
Reduction
Leaching
Which is used for making cycles and automobiles?
Nickel Steel
Chrome Steel
Stainless Steel
German Silver is an alloy of
Cu, Zn & Sn
Cu, Ni & Sn
Cu, Zn & Ni
Fe, Ni & Sn
The Chromatography which is very useful for purification of the elements are available in minute quantities and the impurities are not very different in chemical properties is
column
paper
thin layer
ion-exchange
The method used for refining of nickel is known as
Van Arkel Method
Mond Process
Hall-Heroult Process
Kolb's electrolytic method
The method which is very useful for removing all the Oxygen and Nitrogen present in the form of impurity in certain metals like Zr and Ti is
Which is used for casting stoves, railway sleepers, gutter pipes, toys etc..
Cast iron
Wrought iron
Pig iron
Steel