In roasting : – InterviewSolution

1.	In roasting :
Answer» MOISTURE is removed non-metals as their volatile oxide are removed Ore becomes porous All the above Solution :Roasting removes easily oxidisable volatile impurities like arsenic (as `As_2O_3`) sulphur (as `SO_2`), phosphorus (as`P_4O_10`) and antimony (as `Sb_2O_3`) `4M(M=As, SB)+3O_2to2M_2O_3uarr` `S+O_2toSO_2uarr,P_4+4O_2toP_4O_10uarr` ORGANIC matter, moisture if present in the ore, ALSO GET expelled and the ore becomes porous .

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