Chemical Process
Roasting of metallurgical ores is done mainly to

Remove arsenic & sulphur
Sinter the ore
Dehydrate it
Remove CO₂ & H₂O

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Chemical Process
DDT stands for

Diphenyl-dichloro-trichloromethane
Dichloro-diphenyl-trichloromethane
Dichloro-diphenyl-trichloroethane
Diethyl-diphenyl-trichloromethane

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