CBSE
In Mc Arthur forest method, silver is extracted from the solution of Na[Ag(CN)2] by the use of:
Fe
Mg
Cu
Zn
Gravity separation process is used for the concentration of:
calamine
haematite
chalcopyrite
bauxite
Which of the following is not an ore of magnesium?
Magnesite
Dolomite
Gypsum
Carnallite
Aluminium is obtained by
reducing Al2O3 with coke
electrolysing Al2O3 dissolved in Na3AlF6
reducing Al2O3 with chromium
heating alumina with cryolite