Question

An ore contains arsenic and antimony as impurities how were they removed during the process of roasting

Answer 1

during roasing if as nd sb are present as impurities these are removed in elemental form

Answer 2

Explanation:

Roasting is the process of strongly heating the ore into oxide in unlimited supply of air.This process is commonly used fro sulfides ores.

Impurities of of non metal like: sulfur, arsenic, phosphorus, etc are oxidized and removed as a volatile gas. These impurities on reaction with oxygen gas produces oxides of non metal which are gases of volatile nature.

Arsenic and antimony as impurities are removed as:

$As(s)+O_2(g)\rightarrow As_2O_3(g)$

$Sb(s)+O_2(g)\rightarrow Sb_2O_3(g)$