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How many of the given consequences are i...

How many of the given consequences are in general the result of roasting and/or calcination of concentrated ores?
(a) Removal of mositures
(b) Reduction of metal oxides into metal
(c ) Removal of volatile impurities as elemental vapour or volatile oxides
(d) Conversion of concentrated ores into correspondin oxides
(e) Melting of concentrated ores
(f) Ores become porous

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The correct Answer is:
4
a, c,d.f
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