Explain the following: (i) Why is chalcocite roasted and not calcin...

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Explain the following:
(i) Why is chalcocite roasted and not calcined during recovery of copper?
(ii) Zinc and not copper is used for the recovery of Ag from the complex \( \left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-} \).
(iii) Magnesium oxide is used for the lining in steel making furnace.
\( \mathrm{P} \)
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