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a
moisture is removed
b
non—metals as their volatile oxide are removed
c
ore becomes porous
d
all of the above
answer is D.
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Detailed Solution
Roasting removes easily oxidisable volatile impurities like arsenic (As2O3), sulphur (as SO2), phosphorus (as P4O10) and antimony (as Sb2O3). 4M(M=As, Sb)+3O2→2M2O3S+O2→SO2;P4+4O2→P4O10Organic matter moisture if present in the ore, also get expelled and the ore becomes porous.