Which one of the following statements is false? (Karnataka CET 2011...

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Which one of the following statements is false?
(Karnataka CET 2011)
(a) During roasting, moisture is removed from the ore
\( \mathrm{P} \)
(b) The ore is freed from almost all non-metallic impurities
W
(c) Calcination of ore is carried out in the absence of any blast of air
(d) The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy
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