Wolframite ore is separated from tinstone $(SnO_2)$ by which of the following processes?

The idea of the froth floatation method came from a person $X$ and this method is related to the process $Y$ of ores. $X$ and $Y$,respectively,are

The beneficiation of the sulphide ores is usually done by

Match the method of concentration of ore in Column $I$ with the ore in Column $II$.

$I$ (Method)	$II$ (Ore)
$(I)$ Magnetic separation	$a. Cu_2S$
$(II)$ Froth flotation	$b. FeCr_2O_4$
$(III)$ Gravity separation	$c. Al_2(SiO_3)_3$

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

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