In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to
The migration of dispersion medium under the influence of an electric potential is called :
Calcination is the process in which :
The ore that contains both iron and copper is:
The correct statement regarding the given Ellingham diagram is: 
The pair that does NOT require calcination is :
The reaction that does NOT define calcinations is :
Match the ores (column A) with the metals (column B): 
Which of these is the incorrect statement?
Lanthanide contraction is not applicable on group of following element set.
