Which of the following statement is/are correct? (1) Froth floatation can also be used for non- ...

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Which of the following statement is/are correct?
(1) Froth floatation can also be used for non-
\( \mathrm{P} \)
sulphide ores having sulphide impurities, and
W
the ore is recovered by using suitable activator
(2) In the leaching of \( \mathrm{Ag}_{2} \mathrm{~S} \) with \( \mathrm{NaCN} \), a stream of air is also passed because reversible nature of reaction between \( \mathrm{Ag}_{2} \mathrm{~S} \& \mathrm{NaCN} \)
(3) In hydrometallurgy \( \mathrm{Zn} \) is used as oxidizing agent in the purification of \( \mathrm{Ag} \) from \( \left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-} \)
(4) Roasting can convert sulphide into oxide or sulphate and part of sulphide may also act as a reducing agent
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