The process of converting hydrated alumina into anhydrous alumina is called
Roasting
Smelting
Dressing
Calcination
Bessemer converter is used for the preparation of
Pig iron
Steel
Wrought iron
Cast iron
Copper is extracted form its ore by :
Electrolytic reduction
Auto reduction
Cyanide process
Magnetic separation
In zone refining method, the molten zone
Contains impurities
Contains purified metal only
Contains more impurity than the original metal
Moves the either side
The purest zinc is made by
The Mond process
Bessemer process
Zone refining
Electrolytic refining
Important ore of Mg is
Gypsum
Carnallite
Magnatide
Which of the following ores is an ore of copper?
Argentite
Hematite
Malachite
Calamine
