Electromagnetic separation is used in the concentration of

Explain the concentration of ore by Magnetic Separation.

Which of the following metals can be extracted through alkali leaching technique?

Which step is involved in the extraction of $Pb$ from galena $(PbS)$?

Which method is used for the concentration of the tin ore containing $FeCrO_4$?

Observe the following statements regarding the purification of bauxite:
$I$. During Hall's process,silica is removed as $Si$ (vapour).
$II$. Bauxite ore contaminated with $Fe_2O_3$ is purified in Baeyer's process.
$III$. During Serpeck's process,$AlN$ is formed.
The correct answer is: