The process which involves the treatment of the ore with a suitable reagent so as to make it soluble but not the impurities is called:

Reagent used in Bayer's process of concentration of bauxite ore is:

Bauxite,an ore of aluminium,is purified by which process?

$4 Ag_{(s)} + 8 CN^{-}_{(aq)} + 2 H_2O_{(l)} + O_{2(g)} \longrightarrow 4 [Ag(CN)_2]^{-}_{(aq)} + 4 OH^{-}_{(aq)}$
The above reaction represents the process of concentration of ore in the extraction of silver. This process is:

In the process of extracting alumina from bauxite,bauxite is concentrated by $......$.

In the froth floatation process for the purification of ores,the ore particles float because