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a
Phenomenon of removing layers of basic oxides from metals before electroplating is called pickling.
b
In the manufacture of iron from haematite, limestone is added to act as flux.
c
An ore of tin containing FeCrO4 is concentrated by hydrometallurgy.
d
Both (1) and (2)
answer is D.
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Detailed Solution
An ore of tin containing FeCrO4 is concentrated by Magnetic separationIf either the ore or the gangue is attracted towards the magnetic field, then the separation is carried out by this method. For, instance iron ores are attracted towards the magnet, hence, non–magnetic impurities can be separated from them using magnetic separation.