Which is correct
Aluminium : Calamine
Copper : Malachite
Magnesium : Calamine
Zinc : Carnellite
(b) Malachite is an ore of copper.
Which method is not correct given for refining of crude metals?
Which of the following process is not used for the extration of spelter from zinc blende
Which of the following species is (are) desirable substance(s) in extraction of copper but not in extraction of iron ?
In electrorefining of copper, some gold is produced as
Carnallite on electrolysis gives :
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