Roasting process is used for (1) Impure \( \mathrm{Fe}_{2} \mathrm{O}_{3} \) (2) \( \mathrm{CuFe...

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Roasting process is used for
(1) Impure \( \mathrm{Fe}_{2} \mathrm{O}_{3} \)
(2) \( \mathrm{CuFeS}_{2} \)
\( \mathrm{P} \)
(3) \( \mathrm{ZnS} \)
(4) All of these
W
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